Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca1a9e73389f067…

MALICIOUS

PDF

84.4 KB Created: 2021-08-23 15:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7896f9604c5469d0fcd2941473f7ff07 SHA-1: b3fd3b5b8abac7925924a19392871bca7dfadc94 SHA-256: aca1a9e73389f0676460d471b0aaa30273c7ebfa14d7c8a39958683542f8b1d4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number to trick users into calling, a common tactic for tech-support scams or callback phishing. The embedded JavaScript and link farm structure suggest an attempt to download further malicious content or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://familienarbeit3plus.ch/userfiles/files/jegolowelitalamamutoje.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/9000406308.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/xukapox.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9edd62bef---dobifogox.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/18884609053.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160e912cf27c7d---zesezejumebuse.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c0cccbc4a6800897db50acaa57598391/96064963041.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b4c0c8b7c3---37680580273.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/kamerevolugufumetoke.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e39aa1831ca---34789260036.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/97093347235.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/pamiraxuje.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/zuxuxerabixomuwumomozovam.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161ff7ef1b---6535530221.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210614_09A10AD8C370ED42.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a08b202654fde38b4544d6bcd45a65f1/xenuvoragid.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/63040334033.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/70079592861.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/povubade.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/82809992020.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/49026715415.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/51303597860.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fdd829444---xulesiborenafonuw.pdfIn PDF document text
    • http://thongthien.vn/upload/files/93523134922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=i+blink+too+muchPDF 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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10216 bytes
SHA-256: 1ccc7af5f3e678bbadaa90cda588d0e32dcbd637f00deb6a2540812697ced156
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 17448 bytes
SHA-256: 712a142bab595cce8c438d3aa81ac9754a78fbf6effb2008f46cca653967f437
font_02_sfnt_off00012be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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