Malicious PDF — malware analysis report

Static analysis result for SHA-256 756310a01055d170…

MALICIOUS

PDF

77.1 KB Created: 2021-10-05 08:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3c76484b4d2ce461b05dd960ad522cab SHA-1: 55f1313bd69b6b08404e7bad93663007a0a183d8 SHA-256: 756310a01055d1702ac79dd53ac28c87240a0a8b221d43346c746bf80f0b02b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

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://catamma.ru/uplcv?utm_term=a+system+of+linear+equations+is PDF link annotation
    • https://tivirtual.com/userfiles/file/86420228728.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/42278378441.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/nepinafo.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/xopetetopufitoro.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/sifijolofopuzufop.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f6bc5fbd1f533ed4266f899dbb164942/nubuzus.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/56468391796.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/xujusupasimaxepula.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/70690083276.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb73446bd5---44691517576.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/sivar.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/sizulopodojerokiwusumivi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c52cd2879a---zabatukadilava.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/sazijunek.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/26869357848.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/jopanoxaj.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16149e33247979---52462209471.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/7990959170.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/sexobilani.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/minobisokakurex.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sga7csh1eqjm0aglvjad7ururs/dadijanexitekakaji.pdfIn PDF document text
    • http://newcompanyindia.com/admin/userfiles/file/42111889690.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/13424459064.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/sunuruxoxagevagusokemopof.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/nejafinutewagavam.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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 10716 bytes
SHA-256: 3f7a025dc0121745b5668168bf13d488bc8e3d0a642edf3335dc5df0fe5b1c52
font_01_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 17832 bytes
SHA-256: 4ab605ed5c55b40b2e6a0fd1aca3be3dc55f9fc323ca4e6adc33f3932275586b
font_02_sfnt_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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