Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec16278c66d638a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 10:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32b705339d69787a4a743582e273f80f SHA-1: 485dc12aee804a8f8bbb1e78e183bd4af6bc20f7 SHA-256: 2ec16278c66d638ade94189750722f0269143c8a87b27f8d347776a0685ffd77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://actor-conseil.com/files/file/54228579563.pdf In PDF document text
    • http://auto-spec.ca/fck/file/modinasuwab.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/2450226401.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17a5eea02---59258769811.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/fawadifajusonised.pdfIn PDF document text
    • https://area5srl.it/file/55950380573.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/bajufesaxevuwolunif.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/menifa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a6711f5d3---70851260093.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/5613712610.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ad496d0d---24759449656.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/sudusapefov.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/84646744174.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/29a51e8df9cf86a87251c8eb4e88906a/55202168799.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/12044000725.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/nojewapasedizuzibasinafe.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zebap.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sanenuwimonisowudat.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff14a99d3---nanejiso.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/11209611571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=importancia+de+los+catalizadores+en+la+industria+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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10892 bytes
SHA-256: 83412d8c5bcdf465448ab450de9630430b380ec21dba49d857f5cb4d7d800118
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 18112 bytes
SHA-256: abc25482bdda537e0eab3fd0557b7d6adaafadc8ab6f084c7f1bea256b063a37