Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffd7f2f910e8b45…

MALICIOUS

PDF

91.8 KB Created: 2021-07-25 00:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53303739bae92fa44eb6645c35d48303 SHA-1: 4cd7cae7f8d75929f2cb426b0af5766df2bf028c SHA-256: 1ffd7f2f910e8b45278e65e08fc8ca2aca79de197b6bcdbbeee8424f0c20d3a9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation Suppression

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains instructions to disable security software and mentions a password-protected archive, indicating a likely attempt to deliver a second-stage payload. Numerous URLs pointing to compromised CMS uploads and link farms were extracted, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee605f4dc---82990251007.pdf In PDF document text
    • https://its-bulgaria.bg/files/file/35006292124.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c00c0c57a---19558482723.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f387c27335c618660aca4bb3702fae73/mozuxewaxumuse.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e12073090b---42629826711.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/iesmlekvut2ahkq0l1pmj5gai1/zuwado.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gbpr9cqv934rseso0et92grpr6/29495382467.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608937a1a7b72---62907371205.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/simobepusolubelotafokadu.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/defedanepeva.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/26739313626.pdfIn PDF document text
    • http://egyiksem.hu/uploads/file/30985634055.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/535e874d6e10a110e9404600a251481c/71199903563.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/teuc17sqrdb7heoostddniv5bb/70439270222.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/zenatupa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1e0958b066cfdcd28f749c88d2e9464f/zakixaligipatufenolapefob.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/xesenulowut.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/xenoxoveliw.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9c82a36e---54539754734.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/defedipemani.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/af3039127ea86273169ee149eebea58d/xovubudobugatukexaduduji.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/41729408657.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8049e5430b---sunikanajetegikegix.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d697e97317ce0b55a8132888c53e297f/15928191820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=epson+l380+adjustment+program+free+download+rarPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 17856 bytes
SHA-256: 0f887d6fbe44ffaff8e48b91e9eff4effdac4f8b3f9732b75acb5d6d92c3567c
font_02_sfnt_off000143a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A6 11552 bytes
SHA-256: f967b63660bb765527a48e6a49fdf67bc73049f595e8a4c3dc2b6c069cb7164a

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