Malicious PDF — malware analysis report

Static analysis result for SHA-256 a634f353f9b57638…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 07:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be97c5a1d31bd9cb08a37484f193ce09 SHA-1: c9bb59698e3d68cd16e265ad0c3d62709058cd8c SHA-256: a634f353f9b57638da9e67cc6c94be4021e4d518ab085b7c2f120336c36147a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a campaign-like distribution strategy.

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 http://aptchasers.com/FCKeditor/userfiles/file/rowibun.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ac0ir7rdfjl1ng10hkul2k93op/61872467341.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b754fa69b2---jimidanixidubow.pdf
    • http://jucal.es/images/file/25072953828.pdf
    • https://purefeeling8.com/data/file/91155204022.pdf
    • https://zemiigori.com/uploads/file/tumolaratupabe.pdf
    • http://omak1968.com/clients/71178/File/zojuno.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/78d55c303b63f70445d846dab10236f2/45749380108.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a642a2063f7---josodepobujinalasuxepin.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952ae5ef271---jirumikipujoxipapa.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b512693clgoled4o837bu9ug32/gabes.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62acbe1cbb---faduwivizidele.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3c8070a9---44398553063.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/tgp9n226dcv6uepr6aqmkpprn6/95050559607.pdf
    • http://cmtsport.com/pliki/59115089281.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608633fd30637---84451653778.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/tiwanekerumarakugo.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160722669dcf8f---85421667937.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8upf6pgd6q7fmg2oa39bmnisq6/xabujinelalipus.pdf
    • https://llsindia.in/FCKeditor/file/bomatogovokugixozorelu.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8543fd18---fofaxovamunotawina.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e6226b38753adadb9ba5391b1d2cbeb0/bexaperagotug.pdf
    • http://anaminfo.com/attachfile/file/magin.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/hmuosbcjqe74culf1282o20r4n/61228908859.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecafc7d000---doneguzokuponifafefanapop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=harry+potter+deathly+hallows+part
    • 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_off0000f111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
font_01_sfnt_off00010923.bin
22fad18618db32bd91fc8c0e92a8faacc033969491c0198d4dae9a93ce86e9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 17232 bytes
font_02_sfnt_off0001361b.bin
4d276a18264296befb6784f260d43ae25b6e95b9e2ca2df07bc82550be82be9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 10484 bytes

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