Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f70352d325b60b3…

MALICIOUS

PDF

89.2 KB Created: 2021-07-16 05:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb6c5272aaefc054014d8f2c3464172e SHA-1: 453b2785c6ebec918114a102eccb6473d36a3bfc SHA-256: 1f70352d325b60b3f78f5853c730eb82360ab97251c6653100429b51dd56a302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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=install+chrome+os+on+old+pc PDF link annotation
    • https://ludifrance.fr/userfiles/file/6138103886.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pur1l8366ktpo6fpe1s192vco2/lelozozabanevinafikivig.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/sivarafixevipodisen.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b803f8a8---tifaz.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/tuwofewikediwawigudegax.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f5de11bd---65110361086.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079f952a2fb9---mezatapalizogexixaregon.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/d11nnumgmpnbe5a7apv2edaqf3/35896732531.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/51927407715.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/up8ah5bqnj5oi49t0nn16j0001/winunaxusetoxore.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/dekerakanefa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a79964a9345---59365343388.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/72049460405.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c457b747---29249376359.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nkcer43lve218t3l2g36a5bhld/96377584304.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/344df439af92205381621f20428387a6/lobufalavegapebugosob.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4270a75b19---ruwojufofepeviperij.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/mivutexabolisirifirurixa.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8ba5d675---navagapimireviz.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/71430879267.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb8e671bb---66209046604.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/kikureke.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/69b16f88f75b2a8d36b11703b59ca607/41090104068.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/15321866639.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cf2b62d69---sogasanunuvakufofulavow.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_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 10640 bytes
SHA-256: bba2534843a80f5b6480efed678eb84d2328089b2051dea48bb3a82a7f91a7e5
font_01_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 16752 bytes
SHA-256: dd2ed6282879a15b248891bd34ca3e21ec2d678e9774bc87f07bf0a28a535dfb
font_02_sfnt_off00013f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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