Malicious PDF — malware analysis report

Static analysis result for SHA-256 02739326b14a1e0c…

MALICIOUS

PDF

87.3 KB Created: 2021-09-14 00:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4a435b59c2d4aacdaad4a0f5ac16e50c SHA-1: 3ff20f9c56504f047bc255c0f824c8295b689bc7 SHA-256: 02739326b14a1e0caa3f30bcca9f818017b03f584c68182874642b2049f2064e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://tedesco.pl/userfiles/file/58221771174.pdf In PDF document text
    • http://9275522-travel.com/userfiles/file/53899116858.pdfIn PDF document text
    • http://e-sheremet.com/img/78675708892.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xexivejatomavus.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vuveruvijopuxixalaju.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/vupupez.pdfIn PDF document text
    • https://forumsevens.com/images/file/62443045775.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/kudewamuwuroxodisaxoxib.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210905215414319.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d07822e7---jikarumexo.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/rosonudan.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/77468362213.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/6766620568.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/7448758149.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4631700a2---21691557257.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/sogimavogowawikegajog.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/sabefime.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/21314581201.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/61395904962.pdfIn PDF document text
    • http://watch62.ru/files/files/barova.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e37cf63d2a---27589803178.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/1714209144.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/67562692401.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/robipivi.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/dalise.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f009ccbfdfc720d71af514f1abb9efa1/59827782194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+hack+pk+xd+2021PDF 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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 18696 bytes
SHA-256: 757fecf2adce31eb7d67d3d759ad95f74d5b1dee6c0006bfc7f0a73986d0c5c1
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 10536 bytes
SHA-256: 7b31bdc2ab1c530f9ca09f75348b44d4d55603bb76c6fc7ead7b8bd94b2798a5