Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64757f53d4075be…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 04:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe30162de85f46f5db16d190071c4ba8 SHA-1: ed2edc9170994f4e88d4af38bdac269faa4165e1 SHA-256: e64757f53d4075bea849a05dfffb6c269b649a316ca62a6f1f88af67982ac7dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://infrive.ru/uplcv?utm_term=plants+vs+zombies+3+ios PDF link annotation
    • http://studiotecnicoprato.eu/userfiles/files/72830345653.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210911_61638D3CB8645AA9.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8c4ab30ee---rijovizujumopa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495575a851---fuzisixepog.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/gezejolufume.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/76286609479.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd9ad0776---32840552915.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/10908318750.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/28821105551.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wodotokujefo.pdfIn PDF document text
    • https://tekartltd.com/upload/files/61203947108.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/gorilanojutuxusiwudorev.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/gekutudomowosi.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/xisisubuxilobukixaxinala.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/be8f43ad2f22a1f50891db2f82d1128c/fajuvowuwot.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/80246920764.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/45b57ad6a8bc8248a77853c65cc29339/31674752284.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/ripomatubovaj.pdfIn PDF document text
    • https://arendic.cl/files/maxofesi.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/24574611775.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/92665092211.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613629e2987dd---jegafuvenezamoma.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/tiwerozoxot.pdfIn PDF document text
    • https://posh.hr/files/peligasimimibor.pdfIn PDF document text
    • 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10608 bytes
SHA-256: 12d8dd16dad0c68680f7e918db9e94eca7e5019991cdb82e2e1a090a66672919
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 19172 bytes
SHA-256: c04b96f9375b07a9b63e00deb79e944c1532d0d3ddd428c3a262f78ee153e68f

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