Malicious PDF — malware analysis report

Static analysis result for SHA-256 343489eb59486021…

MALICIOUS

PDF

83.8 KB Created: 2021-07-05 08:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08b9a52299d6a26ea707b12feb5fcceb SHA-1: 7749a6367141f3e352791a49281023ad07f859f5 SHA-256: 343489eb594860216244862e7edcfd92b926be4e17c7820468460d1327754d01
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mvrmah3hvc17do11ternf9demp/55604782587.pdf
    • http://simonide.org/userfiles/file/84530671053.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb07dfe2baf---32019656151.pdf
    • http://rcot.by/pics/files/51769050120.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9123bbf7358e2cc8d1d0f801b3aeca4a/90871018091.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c1f9f8da---74527052592.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3108690813---ditexe.pdf
    • http://accessiblevehicleservices.com/userfiles/file/8223464755.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1637516e---49136324849.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091adfb3c979---80416354843.pdf
    • http://shinex-auto.com/userfiles/file/titugujiruzizijubedunir.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/6nmdn250emmhm6c9ecq8vp3c2v/gojugakewig.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8f4ecdf62df1ec8b24619b99725932ee/puvoketeviwawur.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37768c47d---66276340982.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/he9ekms8gfrt0cteu2cr85cgig/80526199210.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/27ce4f81bc8f36878e9d9a72bacc8a30/69279349199.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/766259008.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a40a94ac4ee---safepogi.pdf
    • http://aplus.to/userfiles/file/rosunosebikala.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160989a47ca684---38268710167.pdf
    • http://boracayg.com/FileData/ckfinder/files/20210703_A9C2106C2822EDCA.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b25b2b8f7---jawotusigenujumibozeline.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/30807541209.pdf
    • http://olgapolyakova.com/files/files/57976954296.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+snake+in+jungle+book+is+called
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d0708b584f194f14fcab106b5c79dd8f/linizitinimarudexetexuser.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_off0000e430.bin
d9ca78f196675e8d35f3c2509a6fe2e63f6b01b964c0df721e5fa9017f5fce57
pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10876 bytes
font_01_sfnt_off0000fcf0.bin
0cc84b354fe7c3e7b6e9902f0a1daebed7c2f038f1e767a5da6e60ec5473690a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 17148 bytes
font_02_sfnt_off000129f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 16792 bytes