Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d7617f0ffcbdb…

MALICIOUS

PDF

102.4 KB Created: 2021-07-16 04:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 721b0ccc72ba3e178320e06a07e03360 SHA-1: 7d414772e531cf5e39f292dd7f3b907571374233 SHA-256: e28d7617f0ffcbdbc8563566649fa0777224fca4a9566827cfcd88a6c68c51e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://eastmangroupllc.net/ckfinder/userfiles/files/tikerovoxomizaguf.pdf In PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7079ca575988ce51acdb052a8a18c4f0/bulexibusana.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/bovemozotasiv.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c171a716df2---39873452077.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34505ebb6---ninezaw.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/11951431443.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/euvo08s4q1qcd92rehf5840pgl/webujabujuxuxolux.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802e43ea26f---94827543423.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/88498060549.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/73614704491.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c7656785---75357806593.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/0b2lek6qr15av5vj9qa74vlqfi/tizolebedad.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/eaedd2b3ad0b3d775d24a436c03da1fb/xadefudexevuluxamefisez.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/2578971123.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/897744250.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a7661c198bf4a13085ec03e97e6c015a/89515723173.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gojumenex.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/petevirabotutoju.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc44802a30---nidawer.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/dukisitotugosegox.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/jebuw.pdfIn PDF document text
    • http://maihome.hu/admin1/file/39261208831.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd4c586bc---gumosepugam.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5ea0tefin6cr0g1ckjb9ktgi7o/xegulu.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/68906318711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=canon+law+excommunicationPDF 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_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 17876 bytes
SHA-256: a2597d0fd37c456407f612992f32eb2f358215608c96b072d991f064ad0e3aad
font_01_sfnt_off00015c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000174b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B1 10440 bytes
SHA-256: a383fb4aec1961961f88f4d931836567be34dc1cbfb50ba94c6b4e66734acedb