Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e0c09c4b89f95…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 12:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f57f2e574bdc22c3a297c4b827754cd7 SHA-1: 4061afbf9ee4b38fd02911fca72b50ca6b583803 SHA-256: 8d3e0c09c4b89f95e1486c8f41029acd0a7b14ebc4d8fa7eee015c1604a8878c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://loadcell.vn/Images_upload/files/68096957055.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/budowabit.pdf
    • http://adaviestransportltd.com/userfiles/file/39148873138.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/61457462103.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd316b4ebb---41548322744.pdf
    • http://ahkkpcm.org/userfiles/83743509536.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/sugubil.pdf
    • http://nissanotogovap.vn/uploads/images/files/67921522379.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/uk6pgbc4s9tio712cbmvnm1t8n/54860354250.pdf
    • http://daegyung.kr/userfiles/file/20210909201633.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7882edca4693c9769331ca7f72ebeb06/55488717323.pdf
    • http://tofuyatogo.com/uploads/files/33237242920.pdf
    • https://wanna-drive.nl/files/File/xobakagovelobo.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/44349849095.pdf
    • http://monteconsultants.com/image/upload/File/juvalefatugenaxotovepidoj.pdf
    • https://playerpress.com/ckfinder/userfiles/files/35561285156.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1a6593d0d9ab2984e28e155c1c1aa771/gonidezajutijizam.pdf
    • http://fanta-life.com/userfiles/file/pomatoviwibagot.pdf
    • https://war-old.its.vn/new/userfiles/file/38921184630.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0ab041ca12b3a649e234cbfe0fc7d9c3/22181904467.pdf
    • http://cascinamana.it/userfiles/file/zipebuwazu.pdf
    • https://karolinanowak.com/userfiles/file/47415769350.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+remote+camera+app
    • 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_off0000bf1b.bin
8d282228239e8b04248e8b908d920759e52020a68253d411dcf35c65efd7d0eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 17668 bytes
font_01_sfnt_off0000ecd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
font_02_sfnt_off000104e8.bin
cba71f82013afcca27a353fab82264eb4ed96c80bd38478efaf8983ce9e830f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10444 bytes