Malicious PDF — malware analysis report

Static analysis result for SHA-256 449e89d97a14d268…

MALICIOUS

PDF

90.0 KB Created: 2021-06-30 21:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2391b6e881c4e4575e56819e06658243 SHA-1: 4f109740d2dd58490afc1a8eab7f8e5f057d9215 SHA-256: 449e89d97a14d2689f2e77b8513d19fff03c7a75c326f85678ac34cc58fc6c89
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=m1+131+gaming+mouse+dpi
    • http://dfh-consulting.com/userfiles/file/72576217956.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160950caad499b---41286799923.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f49579e0d---bigomezajipodikitukafivol.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/getimigizibepura.pdf
    • http://jorkurojus.com/userfiles/file/temikukawixagetit.pdf
    • https://congchungnguyenlieu.com/uploads/files/pipoletezekixi.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc5e83f86d---wozorimofogivam.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40c6d8e63---pobavafiganoxevu.pdf
    • https://greenline.bg/userfiles/file/2049283841.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1033d4e803d37560030596d0125ad778/11635588470.pdf
    • http://nfraccon.org/userfiles/file/45783483805.pdf
    • https://infiniteprospects.com/FCKeditor/file/25459044340.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/74jdg2hs54he3his9o4irkuhgj/pavipotatavosojodixamoju.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f39890475---39988413547.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160890caed1eaf---wilatabexusob.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1837d59552---37709462781.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a990b516ecde4f786bc7e75f9e1c6cb7/lodinipafilizabumiki.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8c04b1bdf24dc01c34190f1e246df060/tasalip.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b9eb1f720---89830049443.pdf
    • http://beiks.info/public/file/bomudurototupafofu.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b679fb510a2---fepemikupote.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/gubogokiwokob.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/k1f35so4ai1j6dcgnsaf83conm/62681511772.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/8vj8ia8bbge5ds3qrke7o9d92g/koxewari.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_off0000f9a5.bin
bed4abe08f4a4c68305cd3172266e88cddf4ccd1f0638bbac47cd862fb920b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 18476 bytes
font_01_sfnt_off00012a27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 16792 bytes
font_02_sfnt_off0001423e.bin
45b9775e981aadb7167563e3467ff264f7ab4c3d5f291a364ec1bd9a3ab80a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1423E 10808 bytes

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