Malicious PDF — malware analysis report

Static analysis result for SHA-256 90711e8ea8df4c5b…

MALICIOUS

PDF

95.0 KB Created: 2021-09-11 11:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 305533fed0671dfca3602fab599add3c SHA-1: 7282b9b7625a7bed89dd8b352682f2368fb05a1f SHA-256: 90711e8ea8df4c5bbf8650c342b63f495911b70a4d36c151f493815b3dd93e04
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan distribution vehicle. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to lead users to malicious content or further infection vectors. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.cottagegrad.ru/files/file/samofekuzikusezif.pdf In PDF document text
    • http://supermarketdv.ru/files/file/65358310563.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/xivefaxu.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/40673192909.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d86f72839921ee2da8bd51b506e93626/sexid.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/fujunilipasa.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/94623433061.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5d2qc89dmc8171f0gh3kped54p/tikebotulebiwow.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/4357461864.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/58442561632.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613516e92d8b5---ravusunanusa.pdfIn PDF document text
    • http://yanartextil.com/firma/files/wirolarinimo.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/33995692960.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109030658278235.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109060005249362.pdfIn PDF document text
    • https://kvzriu.org/images/file/dudikasinudidazibufidegeg.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/35255407320.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/63132834725.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/tikanimoxugajikeg.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/33930555045.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/46269203565.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/28082528696.pdfIn PDF document text
    • http://petrduchek.com/files/10775689083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=snake+eyes+new+moviePDF 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_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 17920 bytes
SHA-256: 4a5d65ba43dd27bf78774a0394c385693972e2d48b933bcdc2094d95897b0c48
font_02_sfnt_off000156d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D2 10460 bytes
SHA-256: 2b0a00987dad370429e1467f448a187c2f5f8bff0f21418d5200e037a67b19ff