Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c2dd41fe0f2281…

MALICIOUS

PDF

88.1 KB Created: 2021-07-15 22:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a09703c37ee8e6b9af653dd10212220 SHA-1: 456d6fecc2722238c7d95cf712713559a96844c5 SHA-256: 79c2dd41fe0f228169d69964db333097bbb48e78685dea9a4109ee44fc2d42a8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS upload storage. The embedded URLs suggest an attempt to redirect the user to potentially malicious content hosted on these compromised sites. No scripts were extracted, but the PDF structure and heuristic firings indicate a malicious intent to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a31837702---pawowuvifovataguvabu.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/40a57e21ab50fadab7f3ffd7439052eb/pijadapoxiremis.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vb590ltqt00mlavlilrhsm08e1/96149537293.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbdff14ab---bovajixezupijoledegimosa.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/69841503476.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c055ef3fbd5---89400786026.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tijurijibop.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/zitatunipe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809424d36d1---88092343547.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/51192112677.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pepebuxivigunopex.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/18511789989.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4e95791b---541538503.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/92d31f44d2e78356fc40dcdcee84a1c2/vokelabuveb.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/kudepabig.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/gejedisixinud.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e643c335e---sowujoti.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8bb087b04---63727623277.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/8rogvu675vnh2t650ilgh1bfa1/gewipuzem.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e7dbda32b---77753013231.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea52802b3---wuniruwurafunewapisoma.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/315f700de41227390e19b9b7d1c7a1d9/tovifojag.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gebupinupote.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/pupasejuwazu.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210623124311_nm225v.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=you+can+lay+downPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 10056 bytes
SHA-256: a513374da97e0115ae25223ce59786a71cb6fd7f0c470ca0c354740a1bbcfbd3
font_01_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 17692 bytes
SHA-256: 68e82a3657c3073754ca389eeacd79048c944f1b30a99c5a17cd10b3e95fafe7

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