Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92ea2d3cb766ba2…

MALICIOUS

PDF

95.2 KB Created: 2021-07-27 15:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7e15abce3b82194f0b05a50ac72fdec7 SHA-1: 8d83d96a96e1cb9c7beb8e7c1878c910a90e428b SHA-256: f92ea2d3cb766ba214ac4541f1285a99faf7e17917ed93acb38d1a3160b4331d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains associated with link farms and compromised CMS uploads, suggesting a phishing or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload or redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/57118701598.pdf In PDF document text
    • http://lookkorea.net/userfiles/file/38675520604.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/4414422784.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/funobosotoderufavotakusiw.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jolekefegesodijexa.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/61166009003.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21886a20f8---xavomiz.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pasaburiguwasikeweba.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/65948fc759031f3413918da87b352300/nipanebuvuvewawifiwof.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/33542d02b557cb248549f0e044e087ff/xisafewazalefixalon.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cbdeadf54a0e7759cb270b639981784d/94219029818.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/4255351753.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210726005734.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/vurejurebepiwogokipuna.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/85847403193.pdfIn PDF document text
    • http://gekon.net/userfiles/file/69351554820.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lilikavu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c568c63dc67---kamadimapotel.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/32747627879.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b39377d6f4---juravujejimalakenazese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=norton+anthology+of+english+literature+10th+edition+volume+d+pdfPDF 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_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 11376 bytes
SHA-256: c5912401eace525833884a53e108a228b6dcb8d2a87974a7335c366744390599
font_01_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CF 17408 bytes
SHA-256: 3e367d3ae8feba67fa6fcd820c23cf4c6c3065bb5bbd53985bb589f963b49d01