Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3589b0bbcf64665…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 14:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43e00ab4d2b0ecc116696625660f7ad9 SHA-1: 0aa0425d3a6cb50fc9c8a34eab7559a2ec89ad12 SHA-256: b3589b0bbcf6466580e8f1d328a0909c92651ef3fc4c3132351bff330506f3ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick users into calling a phone number, a common tactic in phishing and tech-support scams. No scripts were extracted, but the presence of numerous external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://allytemp.ru/uplcv?utm_term=clerical+agencies+near+me PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f40355ef3---migodavafimivuki.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/sexokixeraba.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7c79433aa777418de1e2e41b6a4e9e4a/tonenuvu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93de63e48b---84467950837.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/84976163578.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vanojunowiv.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/kejeni.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/79062100396.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/el3jmbv28pa80vuqvsu57jcmve/jadefevafifu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d5f84c533---56632844167.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/29290782249.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b2b0a3c3f---73787419434.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210629182850.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/90419171254.pdfIn PDF document text
    • https://fasaac.org/temp//files/21960577818.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745ef58459e---pefuvenoliwufatinowij.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f714927bc73fc4872cee445b9999a198/39971568666.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609599ff18464---59202729446.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902e037eef9---kinesedinivalubaromoduraw.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/lowewotaxoxujolidefiwobag.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/68551d054abaf9a814269639daae9011/gulitotabozewajikuro.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec5c31ffb---kulekomavozifubax.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/fe24a85e93840cfc3da2993d996cb870/80533322527.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

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_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 18312 bytes
SHA-256: 3eae48b37c33b5516d8913f83e40bdbff478016fe39a66eef60165097f1d3907
font_01_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10384 bytes
SHA-256: 768ae26666aced32548f8b2f82cf11e4e46334589888a7897f0a842723d105db

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