Malicious PDF — malware analysis report

Static analysis result for SHA-256 2929ca4f31e6d40b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 19:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87fcb76c443e27ac0c20be539a11fad0 SHA-1: 8dcab2e0ce788eb7fa86eb262a6450ae8e3543d1 SHA-256: 2929ca4f31e6d40b48539765007441a4348a3ce19a20b067f9d9075d43ae95cf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jecoexports.com/ckfinder/userfiles/files/26693263719.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161344df5ab458---kojuru.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/fupuzedogibaxurar.pdfIn PDF document text
    • http://asvpp.fr/pdf/74498792324.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/36021836970.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/medokulafo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/alb8vd29hhk4mn1eg7o1ju75t2/sefovupudiputej.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sekijavanokor.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/jidabubupurebuboliw.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/sugawevofemojevo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/65822224428.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/mevomafimi.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/kugezoxex.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3f9e1f64---gekaworizabirete.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/givurevumexudaxagegil.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/nasogikogogoraliv.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f1aecff7---duvapiwarunimoruxur.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613752a3434b6---19091566111.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/tamelodamowodenebutidurij.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiwipedaxode.pdfIn PDF document text
    • https://rjpexport.com/files/sanokesora.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/e4ge8gnrn48bjp1c93n5s3rvn6/40664650866.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/77726498295.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/859935943.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/74752774592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=galaxy+s21+screen+size+comparisonPDF 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 10924 bytes
SHA-256: 5689a6b30558b9c057157a2dd304ed7e693ad64f2c9e6f5ff7812d0d7d52abc0
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 18504 bytes
SHA-256: df45f4d6fff988406f2deae47dbdc483d7356c9cfd95ebedea4ff59ac0d4bc05
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1