Malicious PDF — malware analysis report

Static analysis result for SHA-256 203c990926780015…

MALICIOUS

PDF

86.4 KB Created: 2021-08-04 18:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5f1c78ad36be25065ec9184e729e7f59 SHA-1: 3d10c047ed1f3f5ff82e2523a59314cfb0980e3d SHA-256: 203c990926780015bf61ab419718d8b60d1b92b64308caacc6b5abbcf926ef61
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware. The presence of a 'download button' lure and instructions for a password-protected archive indicate a social engineering tactic to trick users into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ilovechardonnayhills.com/userimages/92150100019.pdf In PDF document text
    • http://i-harmonics.com/upload/files/8312940383.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f351793723a---63156485198.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/4r6ajo6bal18a71slljrb46quj/vejumavo.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fq96h26067qvt301q76qhebar7/bifonavifidojixijepiwivo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b166cc7339d---26397821663.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd91c8e418---46450803574.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e400b9a292b---50362999406.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/39b3ee69bbad5a03c633b4c5c03fb127/53905596809.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/4810667887.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/bivuxadojozojoketivejux.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/20922333700.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/llkhobhp6amp53hlbb3oi4knsj/85055691142.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/33151843059.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/pamituparopuxisoxegeladus.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4a2s78oislg0raj9p9n835uq50/89389686755.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/44417744839.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/dakazofesowodoxukuxozorum.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-30/20210630163718761464.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16104a843455ad---57491645902.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8d8744ee---56205632925.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4c484e9a---fafivunet.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/polobasefivefi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/jojowizofovudabuga.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16088278d13cf1---52594635328.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/fazipunezifojekesasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+gta+san+andreas+highly+compressed+for+windows+10+64+bitPDF 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_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 11828 bytes
SHA-256: 06afa3ab4db2180f8aaa9b541832d973855291e9869cc9b7b055521639d4f5fd
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 16980 bytes
SHA-256: 2a1fbe7144fb66eb4271363278e7dd2991e7fd9e501c29fd99e0304168b50a21
font_02_sfnt_off000132f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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