Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6425341132a17d…

MALICIOUS

PDF

72.2 KB Created: 2021-08-28 03:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d44a239c34eaa876757d14aa5497953 SHA-1: 0afc27e13f263837a7a92be00a5e4d3d6fa4f2e5 SHA-256: 7b6425341132a17d56358c9c6516cefc23c55c6e5336d463e1a792bc3fd6e3f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. This suggests a phishing or spamming campaign aimed at driving traffic to potentially malicious or deceptive content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0399d1a8---lerimoxevokadapapijune.pdf
    • http://unipsyclinic.com/userfiles/file/20210517050059.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e961c2d8d---tabamo.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d94cae96bf10020d2947ce35e9e433af/71902361325.pdf
    • http://jowinbio.com/upload/files/202108071430421715.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0e09046e---sapaxiwijo.pdf
    • http://bawaconstructions.com/editorData/file/gifazelinuj.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6590ab0169---10183637881.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860858f2dea---zodarezirekexikifu.pdf
    • https://doitoutdoorz.com/file/eotjJhKS2rX8GDal.pdf
    • http://bigsvatcharasith.com/userfiles/file/mosesanebumaziwedev.pdf
    • http://zh-huaxun.com/uploadfiles/files/85105347624.pdf
    • http://kpdb.org/userfiles/files/4218165164.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c22727ba---rexuburatarikugatomene.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/vokefukizifawokedimaxo.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e57c09e5---xodolimonisizevufonagu.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1a5afe51cf794c282b086b410e82a848/28759169453.pdf
    • https://mumegram.com/userfiles/file/11791657978.pdf
    • http://fullx.net/files/guxunadawobat.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa3d94d1e---boramekidulunomobat.pdf
    • https://skvacations.com/userfiles/file/83247733597.pdf
    • http://21cedu.com/pds/userfiles/files/87851236494.pdf
    • http://baobiachau.com/luutru/files/40434113947.pdf
    • https://swift-tw.com/lcc/upload/files/supopunujajomudab.pdf
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/78287330312.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gen+z+not+going+to+college
    • 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_off0000b6bd.bin
f8cedd4716cb950fc1372efd1411ac5a4cc22b456b58a75a803ed6e08a1e5763
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BD 18324 bytes
font_01_sfnt_off0000e4c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 16792 bytes
font_02_sfnt_off0000fcdf.bin
ddadd3f3ee4b281a343032d303d777a2e8e82341fc07ae5dde1b02ec1fa99eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 10076 bytes