Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce90729f55991a51…

MALICIOUS

PDF

87.2 KB Created: 2021-10-08 19:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8baba6f4108dcb15ae635f1f682bb07 SHA-1: 7f735f1c6e04394a031996f2ee0d8e5b52d126eb SHA-256: ce90729f55991a517a307c8784eb4687a4535d5d5938ac477f93be186d244285
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The document's structure and content strongly indicate an advance-fee scam, aiming to trick users into clicking links that lead to further malicious content. The presence of numerous links pointing to disposable hosting and compromised upload storage reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://keralatravelpath.com/uploads/file/17540304861.pdf
    • https://taybaite.com/userfiles/file/fagutokorabodat.pdf
    • http://praconsulgroup.ru/pict/file/fonigigifopufapegegujir.pdf
    • http://canphantich.net/Images_upload/files/41408049544.pdf
    • http://ecole-belair.com/ecole/file/nagoporuxurinat.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a23bfbf27c4d8f947a8ff14efbfd0ad/kiwowamor.pdf
    • http://mid-europe-ex.com/images/blog/file/61001020434.pdf
    • http://steakclubhn.com/campannas/file/3243419206.pdf
    • http://ouhkpthaa.org/userfiles/binawovep.pdf
    • http://sevvalturizm.com/rsm/files/junafetunumuful.pdf
    • https://gedayapi.com/userfiles/file/16847902508.pdf
    • http://zhihepvb.com/upload/ckimg/files/202110022136517020.pdf
    • http://pm-ural.com/uploads/files/xiditas.pdf
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210923170407.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b20ad1bed---81031146998.pdf
    • http://tnhmc.com/userfiles/file/22651391793.pdf
    • http://startmatbaa.com/userfiles/file/sidetowogexebejiganibuxe.pdf
    • http://epmachine.ru/d/files/75428148848.pdf
    • http://stellamaris.cz/userfiles/pemikadinovub.pdf
    • http://gaudi.tw/upload/files/4475721009.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/89248224020.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/30606634188.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557b8e8d8f6---noveritolefofas.pdf
    • http://ferrocom-spb.ru/userfiles/files/54719999993.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=property+without+will
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 16792 bytes
font_01_sfnt_off000105b2.bin
03ddd75f060b6bdfc9315e53ece6bf68bbae3d0b6edc85b506ecce105e02c7ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10216 bytes
font_02_sfnt_off00011cc2.bin
d7f07df6473834f025aefda02a11da1e9d4c4aa65e3fe7599c0efd8e2f2be327
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 19292 bytes