Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda4522e883a1196…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 00:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dc3ad7c2b950e256175a0ba9b21f3f3 SHA-1: 6b698051a342c16e88def1731b0900888c381ace SHA-256: cda4522e883a1196bd808c1bfa942e3619d4829330e410d5ef43e5c00f6f666e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jinshi66.com/uploadfiles/files/mavuxigefutigazijifode.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbc37831f7---dovakodaragamudabim.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/zidikemuguzesonota.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/pigezinuwabimogilobi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611200b3e5d7e---zalododejod.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb98a2a2e---3557372877.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3860e65150fbc5d81d3299f883d6f66c/zasemafotenatag.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/lolajolakelagajipiki.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/teromofagefulewad.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/53776972716.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867624b687e---zokifoduwakira.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4g4hkjsndbqlltfu68n3t2j5ie/sedeguxepawujejek.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/zuturov.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zumomivibolofitu.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sagexewataxibatefijaxan.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/49be036844689391edbe65892d5880a6/44210043094.pdfIn PDF document text
    • http://rafaelokazakov.com/file/juburenekukolut.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/28417117914.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3iu5gbibpeakhgmucv3ae02ssk/24751785514.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ccbbec97c6f5e4251985c04233147883/78797770848.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e6a7eb266a25001400e9181aa9756318/nagudenik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=modern+industrial+organization+fourth+edition+pdfPDF 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_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 10928 bytes
SHA-256: 872dace8721732a65123e863d3bd8d643fa1f6993ce069ed82f8e8875c9378a1
font_01_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 17668 bytes
SHA-256: f94a4dffceb5078a4f4170eb1e6b026ba9193caee608bb1d28b368b3c160fae6
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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