Malicious PDF — malware analysis report

Static analysis result for SHA-256 879e94558e377cdd…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 16:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00282ab7b07e3e62afb75267ad4738ed SHA-1: d546dedab110bf6a2b027e45a6eb3de468ecd872 SHA-256: 879e94558e377cdde52519e2740c2da0484dc374252213d8b45274d1ec5ed095
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://nextgenship.net/upload/file/20210802162792450918.pdf In PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/48968672309.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/49843d3293dfb346c4eb9355c0fd2694/13355029542.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/7792922297.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e5f31368---dezazipuxif.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/b00qlfl3kf8ie8vet4qqmcjksh/guwejibuzafitotitenigol.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/53432904328.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/92005282856.pdfIn PDF document text
    • http://519pf.com/userfiles/files/35323134667.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1f546c18---39996438739.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107894795344---rodip.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/spfibf3ajs4jsqn8ei21015m72/retujetogagelavazi.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/nijapidukadilexekatezivu.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/gigomuzedisaxaziti.pdfIn PDF document text
    • http://berbun.com/user_img/file/46586073323.pdfIn PDF document text
    • http://vyaspublicschool.com/ckfinder/userfiles/files/nepufojimawopazukeneladas.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/85316604221.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e5737f1da8ca3460f78168ad1594ecad/38009085788.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/pumunawanadovu.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/11423171864.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e04dd3b5---17508780722.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b89e3e744a8510b885addbc16de21981/27294808637.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4b2a0072d882cd3d5af62f971a9ffb84/dikijuwexadasujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bcom+accounting+bursaries+2018+pdfPDF 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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 18380 bytes
SHA-256: 49a878f7f47f8b1eeb5bcfec842ecc9180f4fa736a2edfcaa540b72b548b94e6
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 11712 bytes
SHA-256: 2a5b7eaab23c28311de151da776f8ad8203facb0c1d9b97f0cd4f3582acc8bf1

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