Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c42bbff3f188ce0…

MALICIOUS

PDF

100.6 KB Created: 2021-07-01 21:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67c0621bfa8f0389867a96b3e06a5c35 SHA-1: d0cabaffd2b93626441c120ca4576295dc6d8f94 SHA-256: 4c42bbff3f188ce070af7dc3397998c5519c8b7546116d55cd4dcfe233daca18
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=canaan+holy+land PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9621bd8b92ba5415d9ff7874fedbaa9e/momaganenowaw.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/55f5edf6768e38084cf4a94a86108380/54807360219.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/31972901580.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/32c0de9c76a1e0c1d585029469fbd1aa/22325390258.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/194dfdded8406cdad5fb7385694e0f49/gojuzexelux.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/35a885047fe9c01c7f98db7fce321a6d/44187810946.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d4g4hp4teb4pdrenjb5hlc4g7v/58530220239.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/87977641946.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/nqlldebkoaj5r3mdpinrlu3c48/78538247319.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a9dd15da9---bodirolabimuvizop.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/17594d9f48af95c070e4f320ab9e0330/sokaribaduvujosos.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fidusujawamobuvojupu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fca3736084c595edafcfdf376fbe54fc/mufive.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3148806201bcb24aebb1bea84fab8b4e/9071272887.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/466c023ab6ebf138ca967570dd909ea9/namesegapogafumubolol.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607219b063d99---91945153032.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/worisovuke.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sic3vr2498g098q05v7ms40j94/magolapotewegativem.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097259d76327---negusuzefibilimevu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/66604878675.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a728bb3c---4681297890.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29597081d---81173421088.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/67332446440.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a353f8766f4---vibiwevitejimejazeraridek.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/kiborugup.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kofupawonuvepumijib.pdfIn PDF document text
    • 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_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E17 18428 bytes
SHA-256: 9321aafc243ec1e943eded155f37b69a2e346e31cefa26262220a842ab9e7726
font_02_sfnt_off00016e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E1F 9900 bytes
SHA-256: c8706f61bf5980926d7aa892eb435e9a823b04cace22b2674f964978721ac38d

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