Malicious PDF — malware analysis report

Static analysis result for SHA-256 158029900c6e1666…

MALICIOUS

PDF

92.5 KB Created: 2021-08-15 17:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40f089ba814b12287db72747113920ba SHA-1: 97ba361890fb3c60d2382e1e7a45f872ead38843 SHA-256: 158029900c6e16667635247224cc8a0814084e1d1c88e10e7852838282998c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate 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 0.9979

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 https://nomylo.ru/uplcv?utm_term=how+to+get+apex+coins+free
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/93ce90cd2b60a2b5d50ee722c937aea7/42762577988.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/70598325812.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/3u25sfagvh2lk1lm2egaqf8n9p/gerikuv.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/aqgdmak5fgb4kjiog0qd07lpj5/fuzijapodasebibozob.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec100e12a---fevebinid.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7hsda16d4a0cp0q3ao7pusjemu/bugebinosoxivo.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088165277a62---rererofej.pdf
    • https://liftsystems.ro/LiftFiles/file/80245519309.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/59595725515.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/su561vtln49ske7ncti8rv1ec0/lekuborosuxodapukosejumo.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/tvmfc264ad70qvuqkelq02ouhl/32460124977.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/60254439340.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70e8af930---95409624590.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dfbfdfad0---zatanus.pdf
    • http://auksozvynas.lt/userfiles/file/zuxozopowiv.pdf
    • https://rozgarnetwork.com/ckfinder/userfiles/files/99997503589.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/wejenebumofenovodemib.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/23ec80d63a0b19309bd612b56025f139/xekesawidezumiru.pdf
    • http://pelesiuvalymas.lt/i/File/mikoxarawavodelowevusum.pdf
    • http://smartickgroup.com/userfiles/sularewonafoja.pdf
    • https://theelementrama9.com/userfiles/files/zefuseresisugolaxa.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/87284891955.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160895b779a1b0---41242932493.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001062f.bin
4f0a75f3830b096d3763c8408b5c4a29e863897d651c850e89964964ed4d1b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 10788 bytes
font_01_sfnt_off00011f3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 16792 bytes
font_02_sfnt_off00013750.bin
665aa4368542e6c45bfbd0937925d9803b8468071c5525e87ea5634606faf92d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 16780 bytes