Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc37ba7958dabb94…

MALICIOUS

PDF

88.6 KB Created: 2021-08-24 19:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1bcfd94c685504c70519caef6be67727 SHA-1: 66b6bfa92baf3c5882e1e83ae8ac5febb0d0bc15 SHA-256: cc37ba7958dabb94806b8685a9573fda0f1da2cf169209c3cd5c0dc7c237561e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=math+riddle+questions+answers PDF link annotation
    • http://pathtojanna.com/userfiles/files/gozasuvoleperogakexatanuv.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/gusawizativ.pdfIn PDF document text
    • http://korytnica.net/data/files/45031137662.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21382afc6---jotilarejovogexawoxedilo.pdfIn PDF document text
    • http://sushi-belovo.ru/files/74922833246.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1232444445d8ee292b56ab67f83600db/11140940269.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hgj56qmvg1ig5tgrn2suefq2ij/88967288101.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/jubunuxuvedupabilo.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/60269515129.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777c718f7eb---zavaxusunaxawuluwe.pdfIn PDF document text
    • https://tepihtrava.rs//files/tivejewawozagar.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/niwekuwavujeka.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/nijezum.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9c55d0711dc21ebcb956cf9c96396cb2/17996946888.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zimirobume.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/65204761169.pdfIn PDF document text
    • https://preciseenergygroup.com/media/74514603830.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f316d902f3---kivawiritipebigog.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/muxunoxipubafixafigili.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2a3nqn51k6k85gnvtlvpt0ss1/75371640963.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/519a2f6952ecc60e834c993275b6479f/69090723331.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/xuxagumipoporenoruwegag.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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 10668 bytes
SHA-256: 60e5e804255c70540b920c36688530651fdcec4262d06d9cf806c06d248c9d9e
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 17716 bytes
SHA-256: 4d92b5ea25ed03fdcfb6d7dc6103f6f06777dcfcfa9a780d33d7929846262946
font_02_sfnt_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1