Malicious PDF — malware analysis report

Static analysis result for SHA-256 376f6f0bc27e64b8…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 07:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e3367c12a97ef0f7dc229b1398110f8 SHA-1: 63a67ed95d5d6ad3105d2432380c69f0a5838a57 SHA-256: 376f6f0bc27e64b86aea151e49da044747276774e442796cde026b1d1f18c060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=cause+and+effect+worksheet+grade+1 PDF link annotation
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/8tc2it6kqvug73ugmu1rlfe2d6/82870681966.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d9333ed3---71112480033.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/11186270662.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/79702993441.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29d49d27---46371254834.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210629_000954.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a4cfbde3d617e198562a6a9f18dcfe8a/wawovip.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2545c0cd---16827213782.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/tovadamatamazekesuxaw.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/c1s36sv2ju1bvlr3i4355o72rp/vafurojin.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/61084040640.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8821795ab---pabolisigovu.pdfIn PDF document text
    • https://esvigo.com/upload/files/58382426501.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160f34594edc1f---xepugakidanipup.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/18391563829.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/wizozo.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/demowujise.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d17a205400ee4a161fd0fbb19dea7eec/85948002514.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/32450352427.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160713d006f9ce---pakujiroluro.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/99365388900.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/60990083797.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/25958050198.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_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 10976 bytes
SHA-256: 69f28f808a925f6569f1954d0029189b47e0371400a9614b897c44a5c013ee5b
font_02_sfnt_off00012d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 18940 bytes
SHA-256: 0b11f32a98539091bf4fd24ec9edc1f925c86d054ced84b5556492c146026441

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