Malicious PDF — malware analysis report

Static analysis result for SHA-256 f116b5f2ebde8af2…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 17:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9837e635ffdd6178b286d941e662af1f SHA-1: 6da49472d2e26470f0f47506d44b017017a9cf9e SHA-256: f116b5f2ebde8af2c81bebdb6a59ce328c31e93e976188a7c2789141a79848cf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, consistent with a link farm used for phishing or malware distribution. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's purpose is to trick users into changing payment details. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fsoa.cn/userfiles/file/lepilojebixa.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/40549786852.pdf
    • http://imi.vc/upload/files/pumizemuzinajoni.pdf
    • https://pmsp-me.com/userfiles/files/53487329794.pdf
    • http://archifolder.com/userfiles/files/69371969786.pdf
    • http://studiocastigli.eu/userfiles/files/foxoreguvinidaxup.pdf
    • https://pcetravel.com/files/file/bazelub.pdf
    • http://nollve.com/img/editor/image/file/95662228719.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/11150948819.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/81968492552.pdf
    • http://csc0731.com/userfiles/file/20210901115814_1hl5b3.pdf
    • https://tonwen.org/userfiles/file/kalakagopaku.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/96501866815.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613464b33c096---gaveralur.pdf
    • https://intersat.lv/files/file/57231877963.pdf
    • https://absoluteanytime.com/media_file/files/files/63463775763.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/fetuwek.pdf
    • https://orangerun.re/photo/files/tizewofotiloveni.pdf
    • http://innotec-industrie.be/userfiles/file/32972027345.pdf
    • http://terrietanaka.com/library/files/56761500453.pdf
    • http://anhbanglaw.com/userfiles/file/93629697550.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/67680944722.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1n3qqvuj9uq9l0tsiuka9099q2/56640865453.pdf
    • https://sanipacific.com/attachment/file/85359516668.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=transfer+signal+messages+to+new+phone
    • 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_off0000f074.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16792 bytes
font_01_sfnt_off00010886.bin
26b474e39345ba465d2324711617d049c722b1e5b9c8c43f5554148651f4374b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 18560 bytes
font_02_sfnt_off000138a5.bin
a5ce4e46bb03a5af9de6bb2086db83bb70de6aaae64dd28d9d118772f673cc2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A5 10856 bytes