Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ccfe454fc60ef6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 00:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96475b528c7e826e15d59e695405622a SHA-1: 593c873ea01be8935b2a93e038420ebd57ca8a3e SHA-256: 77ccfe454fc60ef6f3d8329413cc6f4001d2cdd61375eb5f387446880d227422
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://9meclinic.com/ckfinder/userfiles/files/41459642180.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141825c579e6---lamejajovapubesosol.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/baputabomonunetodufememu.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagogepinumesuxagefojax.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/88905007837.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/viveretobinig.pdfIn PDF document text
    • https://codecs.ro/images/file/takikulitoga.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/13525999739.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419a7bf248c---rovigiluvelera.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/86450021241.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/manupekatu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/57557495265.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/34305214995.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/jemabumuxud.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2d913c54---barexeveputogofumenu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/97040666876.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/gipikisetimuxaw.pdfIn PDF document text
    • https://blogsma.com/files/gegopabeletu.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/5854504104.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/zepofikowaripunopipeni.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/wawopemuberixiduxawedalef.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109150611386698.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/tizojuvilozivuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+increase+volume+in+bluetooth+headsetPDF 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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 11020 bytes
SHA-256: bccbe02fe64ecc7c849c685eb4119fc70b9bfd6d79065e52c010ca891c6810e1
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 17304 bytes
SHA-256: f6d65daf93a54651d09e6bea3e50d725f0f7dacb0b7a90fbf3d8d380320ca0d1
font_02_sfnt_off0001204c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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