Malicious PDF — malware analysis report

Static analysis result for SHA-256 215b32d716ab8c54…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 20:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a3ae3f0b8ff0af1eceaabb6fcd01a46 SHA-1: d1e75178da5ce722d872e67bf218506588747211 SHA-256: 215b32d716ab8c54255e4ece0249ecf1a9d9c42b491cec244d5af461a3e81d3c
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable or compromised hosting. The ML classifier also flagged it as malicious with high confidence. The document body is unreadable, but the presence of many external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://grossbuch.com/upload/file/vedafugejojebogaraxuro.pdf In PDF document text
    • http://thy-environment.com/userfiles/files/13821997734.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/jawojejutuxikuzasenik.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/mepubifunizusuxopaluta.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/6445200050.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/55159213705.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/38670976854.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/lozunefofazubiwedupo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161412e0667e74---mutozanizivag.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/46bb9b27fcdf8df34143cf3f19d76b8f/45877471084.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/02bf4d6569e53239213cb138d4e74587/selaz.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/13125936015.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/nevutivunupugirobubut.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/nawufomowufebafutiga.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/77929680525.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/27805667009.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/nosiwe.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d38fb453c196ccf659f061f61715067d/fibuboxeri.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///gimuwi.pdfIn PDF document text
    • http://sjhtractor.com/d/files/21453054603.pdfIn PDF document text
    • http://dsfly.com/uploads/files/52220204794.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/67011135172.pdfIn PDF document text
    • http://humanlitech.com/files/files/turis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=booyah+app+latest+version+downloadPDF 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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 18040 bytes
SHA-256: 32776a02d356cb42c200ffbf96ffb4ec59b1d281ba5c7918ca09ccc5e0ab2164
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 10808 bytes
SHA-256: ad523d5c0c3e885d4e3f02ff975428a63d97e7f820c7dcf161d98e2631809a95
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1