Malicious PDF — malware analysis report

Static analysis result for SHA-256 a183956ab34ae570…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5afe31d4de1421632bc9c16818fa75f9 SHA-1: 7343b90f49d5bab04631f80fd0b59da8998e93fe SHA-256: a183956ab34ae570a68afee78d5a234333d3e32c5eae1dc90ca9258e2e3f1736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://drafthe.ru/uplcv?utm_term=android+whatsapp+live+location
    • https://magnettoptan.com/upload/ckfinder/files/xumoriwogelafu.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/87337339985.pdf
    • http://esipro.fr/userfiles/file/zemam.pdf
    • https://terracell.pt/images/file/junavawifi.pdf
    • http://ctkupavna.ru/upload/file/dekinosajenudafarilewabo.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/1124711564.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613907c92a0fa---34581857906.pdf
    • http://gewidor-gmbh.de/uploads/files/29883515123.pdf
    • https://nationalshield-uae.com/userfiles/files/verevowegemeninogerike.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/miposokideloto.pdf
    • http://tuyothuyluc.vn/webroot/img/files/kofokebomagedimesuzixat.pdf
    • http://wlpp.net/images/blog/file/fitoxikig.pdf
    • https://sanvexe.vn/webroot/img/files/11054926717.pdf
    • http://commune-bourre.com/userfiles/file/98627205472.pdf
    • http://lpc2529.com/piceditor/file/73910376050.pdf
    • http://defhjdrjioo.friend-match.com/upload/files/xufozut.pdf
    • http://viprealestatebrokers.com/userfiles/files/95006677629.pdf
    • http://ecolservizinettuno.com/userfiles/files/82445370069.pdf
    • http://karthikeyanjayaram.in/userfiles/file/24102720296.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/govevuvizowulokogo.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/963kjcvn3a0vvf2b2kteu4ma1l/4021690695.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/nemaxadevemil.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/75912795070.pdf
    • http://hcbarrett.com/user_area/file/nabekedajabiwaloza.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f803bd00---vusesosimitexelupunowokub.pdf
    • http://rintoyo.com/userfiles/file/10495571034.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161347b16448da---87636131774.pdf
    • 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_off0000dc93.bin
fe80f7538a6c14ae1d450ace30f24424d5192033fcf67f26121a18e45ee4db24
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 18164 bytes
font_01_sfnt_off00010b12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16792 bytes
font_02_sfnt_off00012329.bin
e97b2af53e96b3ae33033ea855e33a6635c496645c1985ebe1079f4a42304f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 10744 bytes