Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4b71041b1cd265…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 02:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2f8c4956505f6c2c8e447be828b51539 SHA-1: 4928e9bf895358872f9b2b05254c1603196f4981 SHA-256: 7f4b71041b1cd2655e281e7156d097be177ccfd06c466b55c0b8374339474412
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate it is a link farm and potentially a lure for users to call a phone number. Several URLs point to compromised CMS upload directories, suggesting a pattern of hosting malicious content on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) or Microsoft license-boilerplate 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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4609cd1f9---ledisetemuf.pdf In PDF document text
    • https://akvaguru.hu/user/file/botodu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/747a77234616997cbf746e2ae9017598/jasiwafekiwolematebawe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rujirajijunivemifubiviwe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c6e6047e7---xabot.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/95871950303.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d1251a8fdbd3658744e08d66d7d2744a/pikoruvariwil.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b02a75d8---vovamipivuvifizezenenuwu.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210518184556.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b54ee21fb---jaduwazigabumorubobaw.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb68ceb7d---8875853217.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bb4b0d45---68449414907.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/47db7d3793f0e2701780c5a4eabdab3c/dabuxamulufukifigos.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/49702249837.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a03bdf5a183---47144944567.pdfIn PDF document text
    • https://go2germany.ru/files/file/vibixafoseleruzozufop.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c04846b5a39---xurapigi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c774ab5deaf04a6b33d011ae768f8246/jujexijelefeb.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/xeviwadoxevubavazevon.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa91c5d23---30762877723.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/50bb0d1feeeedf3222828a781d72f997/wakijukifirixo.pdfIn PDF document text
    • http://acryl-bg.com/userfiles/file/basivokowixetekavumonas.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd81156eee4---19710831811.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/39736110141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=thanks+letter+to+resource+personPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 10536 bytes
SHA-256: 330060efa06b98f91df41d851aff0788f76225e83b7db49321f5944a45d4bafc
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 17304 bytes
SHA-256: 8feef40e26ebe662a31dac80af2e3c906c90aa9546a875d9aff6c030a18959e0

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