Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc345f30606bc29…

MALICIOUS

PDF

84.9 KB Created: 2021-07-04 11:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49e3d66d5276030c975ffc04a6c5b838 SHA-1: 93fb44bcbe5e6c77311dc125e0171cd9d61c5473 SHA-256: cfc345f30606bc29f6ee0e030f603b54f21891e6bb60b13f8e323d447ad40fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded links are indicative of a phishing or redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7afdbe5698fc2257c4cc0f6d82d71d01/56573354649.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde5919ff0---torozebobituzij.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8bd0d2835f9f189ce890e4d6571a8400/93404776982.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9384feee---11209223914.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4f2c557709be22a3d986ed944839a437/rujiwolefudewibivaxediba.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/95311619974.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0496ab229d0784c0e5440a7a833e1eae/liwaxazopux.pdfIn PDF document text
    • https://avela.md/userfiles/file/94500258257.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/11059072173.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b20a3866e9---wiwubenuk.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/522473548.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rdmhfj3itkc0vlj0jseneprpu7/xojiwoxojoxa.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746b3ca8a68---vetelonusasugifisu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2150e3fb1---28267809515.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070194bed248---49512171641.pdfIn PDF document text
    • https://p87.hu/files/15608465890.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/34466718223.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/599e58a8ed2ca99949254f212d095a23/16184798713.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/i0tr4l9ehjben4fkac57j98nnl/70596979572.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f81f24d46---69362619212.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/14767632318.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6a0f1053663dc2d579c5d0af90413d76/94208383877.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2946ee7e56---zibebirobaxofugatuseru.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742f81276b1---fiwidilibuvuseda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+sum+of+integers+from+1+to+100PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 10688 bytes
SHA-256: bb9dddf723f270f25380f34d0811481370b11099704e4ad44568ba0fc5a1c3b9
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 18140 bytes
SHA-256: 2444566fccfeb0f5dbde39ecbeef63a6a1a72b5fac9f64eb8f8ca4a643f4b812
font_03_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 16140 bytes
SHA-256: 4383213c5b04090fb6dba286691365131616295be937159041ad57a033276ba2

Open this report in the interactive analyzer, or submit your own file for analysis.