Malicious PDF — malware analysis report

Static analysis result for SHA-256 538b85b703c314b1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 18:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a85693e5d36ff5c6a5407bbaf251b0b SHA-1: c9cac790fe5f559c1e47351c4729d8e5c074e33f SHA-256: 538b85b703c314b17a1ed51a1bbaa0c8b6ed31242ee41b253a9d7bbcb12c415e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or scam campaign. The embedded URLs are designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=setting+video+as+live+wallpaper PDF link annotation
    • https://oriental-kitchens.com/userfiles/files/94290203098.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/74378468039.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/90729968304.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ge0fk1f8p7hgg9kgli49ab0bar/runogapixotetaferiwa.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210905_2D7AB57718921CD2.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5e0a3414a980ba61c6a7986e59f29819/84415310217.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/4847096615.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/rakadobod.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/ravated.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/nafumobawofemuvepiw.pdfIn PDF document text
    • https://mlspoland.co/files/file/55418742920.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/64569013379.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/24470258912.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/4667000989.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/73200547586.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdf620e10---93438890396.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/21938889636.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/kekedarusefif.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/semepobaputojarozivoze.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/50225776266.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/gukedov.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/80069333510.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/29415540056.pdfIn PDF document text
    • 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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 17000 bytes
SHA-256: 376dc23813569a4b6b73b48a05ffb58b66236d880f3026c915c47187e3bef8b7
font_02_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 10792 bytes
SHA-256: 52532e3002ffd4e81e178a63764f1db5ddab3edf427a5eaf0c5da73aab0e1003