Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3a0897165228c9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 19:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49056309adca2e2b6f2443a426d48a96 SHA-1: a19e7fe6df6fb97dee0e5c9cc604922d65978133 SHA-256: 4f3a0897165228c9c0447adbdc187a233cb14e1afce9a37d0c9ba81126f0e16a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6771

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://fred-robin.com/ckfinder/userfiles/files/nidawalawijusapasupa.pdf
    • https://shen-su.eu/gfx/userfiles/files/zarafemebuzewimuliru.pdf
    • http://birzebbugastpetersfc.com/files/file/rufadunuwusedelorad.pdf
    • http://naszymsladem.pl/upload/file/67005955519.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/39845967478.pdf
    • http://goldcoil.com/uploadfiles/files/merewikexusujidixin.pdf
    • http://filipdegreef.be/uploads/files/nabaruwowarawabubig.pdf
    • https://alstar.uz/images/shared/file/lezurolixigesej.pdf
    • http://adamlegal.com/userfiles/file/mojori.pdf
    • http://zovsh.com/Uploadfiles/files/88353199484.pdf
    • http://fapannimario.it/userfiles/files/16714650706.pdf
    • http://style4.allwebeasy.com/userfiles/files/vijopukez.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cb4a1379---1135191909.pdf
    • http://www.binghan.my/userfiles/file/6108628949.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/kobesinur.pdf
    • https://la-klamm.org/Files/files/54748000964.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0ed9b5438cf04999ffea701037a340a6/saludulopuxelefelekejowu.pdf
    • http://jshtextile.com/UserFiles/file///48094607325.pdf
    • https://listapp.in/ci/userfiles/files/99919857299.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613222e1a8968---rodolifetuxamutukuvu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840f5a54f9---22038232642.pdf
    • https://bandotrading.it/uploads/file/71026262926.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=north+korea+mobile+phone
    • 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_off0000c532.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 16792 bytes
font_01_sfnt_off0000dd44.bin
4caa475537361d7d277980229ec48ea67312c84593ba36371197055b1057437c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 18020 bytes
font_02_sfnt_off00010b6f.bin
fc0659e9c58c26a230e227510c25581d5ab662fb810421b4cb87a6e80599532a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10560 bytes

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