Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0c5134b34167b9…

MALICIOUS

PDF

92.6 KB Created: 2021-08-05 15:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0d9b59b9e6b4ccf540281e5957584196 SHA-1: aad7dd7c761b671a1a20dc1b371c0c07f3a80331 SHA-256: fb0c5134b34167b91e7d866f63245913210ff5ba071bc2d068a41d06ca36c7fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious sites or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/504813f62ebeb9afb699d2ae5397197a/64788973840.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/23cp31i0t9ql0sjt42trgana9j/votodaxujiwodifonewu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160849406ec2b1---pupesiren.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/5698811157.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/72046281646.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/97b65ac188f036690530111b3b3af838/7853665435.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/netojademotivirux.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6mr2n8p7bqkidmcahdlkskr076/pafumuxuvizukiz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f696a6699d6f9cbc3ef767516fc59cea/6616364589.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/nivurabepapebazoxibataxol.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/bazelamebugelaweri.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843be8cc97---98736337532.pdfIn PDF document text
    • https://lemanssrl.it/file/15262716059.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6e5ceb640e7ac500dd9144464d9329e7/1380847746.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1ced715c---43748271747.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/84938829488.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/92958550761.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d210e7a9---64930159029.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051320322673499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f8c2ba794---21604809627.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/lepapuwolilo.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/92631112332.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9119a9de3d---37260614810.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b1895e52---37698367722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+baby+names+mean+gift+from+godPDF 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_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 17360 bytes
SHA-256: f860655f773fb6af9da069a545faa578403fe559cd9e6e4a0eaa60ce1d26b350
font_01_sfnt_off000130e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FC 11004 bytes
SHA-256: 198399927a891f0a62a0a30a3ad3e0e59cad49573edac99a31a750efd497dc53