Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c33484106a48e4…

MALICIOUS

PDF

86.3 KB Created: 2021-08-14 11:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d127d82e604bc5e3f2dfb4c2a7ee0e0 SHA-1: 83f1efa48059eaa3121c5ce392441851823801a0 SHA-256: 40c33484106a48e4c2f809fe9a9bfd95b83c9d20292af55f6f9b2577f0f3c17c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML classifier score. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://palirna-frydek.cz/uploaded/file/68836660260.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1ea4ac77---85320723949.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/565f6d89f29afc960bc95a25c60283f1/zepamakovizubuzezuda.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/fidobixukisek.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/37338885528.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/90758913350.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/88110772816.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/pbfmjf6p1hieibqgt0hssmokm7/zominu.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/54484792080.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zuvilokuxetufag.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc2071368---39947682110.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/32825644766.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/77096290712.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/lafivofupepazoto.pdfIn PDF document text
    • http://hongdacable.com/d/files/pexutenobenimod.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/giterovu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49da7b55a---25680986985.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i4iqngj99d57q93uu8q5d0b9e5/vavikusomedorofezax.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93fd54e41---zatadivufufigo.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/91882928816.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/968583344.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/dozixogezosi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413f49cbcd---55720500730.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210614_080459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=netgear+wifi+extension+instructionsPDF 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_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 16420 bytes
SHA-256: 57e661867e0463fa1ab882b1ded861720c70caefbaaac8ea2a76a8d85e0f028b
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 10728 bytes
SHA-256: f84ef6d917058a8f317e07d11ca94418bc14276a0a197baef43d9c257d36864d

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