Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f05017ab92a54b…

MALICIOUS

PDF

97.6 KB Created: 2021-07-01 18:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10f0aa5c3f8b83d9804b6154b62a9427 SHA-1: 4672160f155b37d5c2c365607abd433867cd3435 SHA-256: 52f05017ab92a54b107c103d55db068c9116b55a66691201af7457816142b48a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://laborke.ru/uplcv?utm_term=chi+square+goodness+of+fit+test+assumptions
    • https://diphong.com/uploads/logegajezoxitef.pdf
    • http://progfin.pl/userfiles/file/78295046699.pdf
    • http://asfus.net/virgsurv/userfiles/file/nejomarotejobizes.pdf
    • http://botosani.ro/img/uploads/file/vadujejebawewo.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8tf2ie6k61lhgom2q6f53fopr6/petobefupa.pdf
    • https://tavio.ru/files/file/dolon.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/312685939032339ac3715d764c2f9133/75029506360.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/j7blblp2gr90ov5oqlfhjoi9u3/foxerilak.pdf
    • https://zivotzaokny.eu/res/file/47207795983.pdf
    • https://istocdukkan.com/userfiles/files/56515481206.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/25618894645.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b25c6551---54195387919.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb5b422a9e---soxawupivosekijumivifud.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/fcdb5771dff181124a563f5979e801a5/kezajemoforin.pdf
    • https://dolmalatrek.com/userfiles/file/50679995686.pdf
    • https://boyanbolyarski.com/userfiles/file/misuwazoravijap.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fc0f505c0d684b59a1231bdeba44b052/mojirufinilibijejes.pdf
    • https://aquafilling.com/userfiles/file/99580452072.pdf
    • https://pharmnet.cz/ckfiles/files/files/bakajepekidibisatotebi.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3651cac7---rurekadefokoguvebisi.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e989ba43647bbfd52f68e46584476d4a/31908343920.pdf
    • https://actor-conseil.com/files/file/60299137230.pdf
    • http://adveotec.com/img/file/lifagasiritit.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/acf8b1536499202caa8d9d9494180a96/53150227518.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/paxabupunelavi.pdf
    • http://libertyquad72.fr/userfiles/file/xafovoxudegiselulafa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ffd.bin
9b68484405b51d94d7b6b215110d88d3eef8fd5cc9d418ef15c15065461a8504
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 11176 bytes
font_01_sfnt_off00012973.bin
0a7de9b2b8b9c491f77561d5f8dd7ce42d8c3c7ea15f897b1713759b9560e4fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 20844 bytes
font_02_sfnt_off000160a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x160A4 16792 bytes