Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d82958209583200…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 20:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b12d467210859b6423c44d4e49d6618 SHA-1: 46e61f1a22729db6c6c5b47f23097a15e88e036e SHA-256: 2d82958209583200415307bc3cbca590c82658270152230ff841700cc77b33f4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

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://componentcnc.hu/uploads/ckfinder/userfiles/files/9991434516.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5a146d32b2941b8a0735948b61798884/84360905839.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1j05jm6son9fgeiv2gj10duqm1/zijiminawin.pdf
    • http://aceonlinementors.com/userfiles/file/71818378229.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f0a3b32e292931620c5435d5e24c769c/kuxutokajemodabobazuwanin.pdf
    • http://51www.org/uploadfile/file/9683d700b7bb83bb2929b817c08e681b.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2d544e8e---34464331621.pdf
    • http://wmc21.com/ckupload/files/tivopefisezakapedup.pdf
    • https://waroproject.com/file/5299079270.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e703d04c5---6495265567.pdf
    • http://patroha.hu/file/9736097528.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08bf73263---tabadaf.pdf
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/50376636219.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/41004343852.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p0r6na1bc471dgnpeudk9o1mi7/14776531854.pdf
    • https://weddingitaly.jp/images/file/lidavuwomu.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bf8df178b---85337231419.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608123e913f90---toberudon.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ccf3ce717---sokodibikusigisususi.pdf
    • https://pnp-studio.com/fckeditorfiles/file/33502682673.pdf
    • http://antwerp-reefer-tournament.be/argt/files/34416193538.pdf
    • http://hydrem.ru/images/file/47752849247.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8332a9d2a6---befudetijiremudoneluzo.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/t4a31crd2akttl9g4981jt9m14/gupavizumenimas.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7271a63a---rejafarodo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+subtle+art+of+not+giving+read+online
    • 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_off0000f1ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 16792 bytes
font_01_sfnt_off000109fe.bin
97878cf114e2f4267dab1118ef3391c036213bad09b638b611d92171a1624b31
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 17108 bytes
font_02_sfnt_off00013699.bin
38c8c58e719696e13540d54d6e0f5d30abf19ee800bb6f40b9be84a53fd55d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13699 10900 bytes