Malicious PDF — malware analysis report

Static analysis result for SHA-256 922e1b4560cbed67…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 04:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d901ff56f798ef33747d63e50fb2db01 SHA-1: 8913621b5a933e2210ced0922973d4409768610e SHA-256: 922e1b4560cbed672f3a6ea6ba1364729d28c03c2de202437dc4f19ca97c78e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number in a context of billing or security issues, a common tactic for scams. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://irlanc.ru/uplcv?utm_term=mm2+boneblade+value PDF link annotation
    • http://mebizstekla.ru/userfiles/file/tususapuvuzafitinirob.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/bexujitedug.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fef5c209---73317353924.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/taberux.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/39b76db680057b4a1311b0361e928098/88141770487.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/26421943480.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161399c843af68---28845853180.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/48640170645.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/kotaxutavotomu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29d838c26---maserudurogapaj.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/6131791241.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/9126466083.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/fomuji.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/lajobovotisaxowavifow.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/30673487248.pdfIn PDF document text
    • http://didopack.com/files/nuvutilib.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161378d749f7de---9860786454.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/tilafiwefopijawefanigoza.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e11781348---farujeje.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7b607011d2ff1ada814bedfd032788cc/32935933501.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/66284472065.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093b0dcbd0---gufapisosujal.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/85714933033.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210914/file/16316181813939.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_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 17596 bytes
SHA-256: 742e998ce44f98679c6559bf374d9892f98c8472d7cc32f895697f887228f7bf
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 10372 bytes
SHA-256: 9a18095fc94706be3cecce414f0f1f5153b81fed0dcba154e44408a8e1a64628

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