Malicious PDF — malware analysis report

Static analysis result for SHA-256 de380ef280d277ce…

MALICIOUS

PDF

87.5 KB Created: 2021-07-24 11:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bd99e1072538c814b5546c90c0f75af0 SHA-1: 33c3198906d4daf39b0a8e87f86a2d623bd3a168 SHA-256: de380ef280d277ce08111f404818b3e1550f529eac62103b6e4ae1a6b3531efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d34f8c071f253d9f7bd9f5612af9c8f4/rebokazulibifevigisul.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/a66nhqbf7vsts6ajbcegf9l3du/pinunawakokiwes.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb3ee3753---tofodogawujobe.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/87687880263.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d06e1cab94881b62549a75cc56346cc9/tenixaramutiletesole.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2l15an1ije9ef96qjlujpdc8i0/maval.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/94816080600.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/latexideje.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094089b8c13f---47310068343.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ol8939o3fanttbvtj4gq91psd7/4582477094.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7c8bb46db1b2eb272b5a1b0a90b4a896/44168558704.pdfIn PDF document text
    • http://polletnv.be/uploads/files/digazigumipakonos.pdfIn PDF document text
    • http://ge-mak.com/files/volepo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9df53660d---92824172941.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d74fa2d0f---68828967429.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6139443a747e4d852805725d774e88f7/wumofigigodawelu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/149c6f4cf8f7a1e1fa4affb13cbdf96a/gejanemugufi.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/14505767163.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4854adfa---91802376245.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/596e413a022c89581ad569d611862624/7059514405.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/36983338181.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/15463730172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=does+panera+have+any+gluten+free+breadPDF 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_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 18144 bytes
SHA-256: f20e5bf9ba48eb52fd79ba7e58b595a997ee2c9503d71dff81bccd89b25ef385
font_02_sfnt_off0001366c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366C 11108 bytes
SHA-256: b157f790686c4164c7ba71b0230fd0d7b1950331ef5bda1c6c3068f207d2f81d

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