Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca2ca2c60aeaaa1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 17:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 635a83da818016a3183077fc3bd55400 SHA-1: f6530fa95d939a7e0a58559bc45d2924b0b4af8f SHA-256: 8ca2ca2c60aeaaa1073bd368566a356d632f194950df7da5bb8774e6c1d4ccd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term=ford+owners+manual' in one URL indicates a potential attempt to trick users searching for specific information. ClamAV and ML classifiers confirm its malicious nature, likely serving as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nomylo.ru/uplcv?utm_term=ford+owners+manual PDF link annotation
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/11456887880.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/r78nokbrs4qqt72vm3lhesfhbb/80777664168.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bpfjo80oo02ijm6n4i3v7ca6on/sisimatikeme.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bc3df8d3b763b0a0b19a6e7fe812e6ee/fafijem.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/6947864000.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd52d72c28c---73719358.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870e2e9b3fa---68851021579.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eggp3kg7gch6a13mdeg6nn2sa5/jenovi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/89a87ed20278be788ecde1ea0c7d5475/96344044898.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/jiwobifigodojebaja.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/32636545152.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/10993140882.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/siuj9k987vr1tfrsaqm1dj3kk1/gujokoj.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb84f1dfb7---11823609724.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4ra1q91kfloc1o1j1u3jvii3dc/318371168.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/nuzaxewomojavixazamepisa.pdfIn PDF document text
    • https://melz-feu.ru/upload/wifezaferibupoxiwatitulu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d344a5f496---17833100957.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7061503ffd---61901631137.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/12443312302.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6d74ef3ce9735e8b45be02f020896e12/90132301263.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c3884176---43593992135.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/62365529798.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_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 15524 bytes
SHA-256: d653df205db760aa959197f6c8a526b8763755a3dc06f621e6afaa3617aff37a
font_01_sfnt_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10384 bytes
SHA-256: d0376b65de242d24cf951e80b2596a30cd8f78baa7d0c4071c74370555c5609b

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