Malicious PDF — malware analysis report

Static analysis result for SHA-256 d709bfea70713f5f…

MALICIOUS

PDF

68.5 KB Created: 2021-09-09 15:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6701083c12d9a6f7365cc9ef9441918b SHA-1: 1456f328204d629338338505e6133f823d7c15ff SHA-256: d709bfea70713f5fba71dc6a737dc59e8f48f81deeb4611b72409d0d2362f850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful content.

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://anukulagrotech.com/ci/userfiles/files/vamebufew.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d2ec549a72ccd16ccb3724af1da5b32d/55087118744.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3e29f3eef9056543f7918ead0c6d616c/xeteretajagogojow.pdf
    • http://travelspace.pl/userfiles/file/80281119588.pdf
    • https://securitydm.net/slicice/file/wimosutu.pdf
    • http://kovacsoltvaskerites.hu/images/file/jowepuketaselo.pdf
    • http://ibtaker.ps/userfiles/file/gatiligixakigomeg.pdf
    • http://mirutte.com/newsfiles/files/34505764167.pdf
    • http://dgelc.com/userfiles/file/20210902170731.pdf
    • http://mini-garden.ru/userfiles/file/zunumenozeduwizifu.pdf
    • https://linker.tw/files/nusepipe.pdf
    • http://vanhacollection.com/images/files/11875672211.pdf
    • https://n-zvuk.ru/upload/file/jisane.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/xowiranubiwomovigunulidi.pdf
    • http://nanumed.ro/uploads/files/jowejogexuto.pdf
    • http://giasuminhtam.com/Images_upload/files/suwobuw.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/redagedakomasivim.pdf
    • https://ddnepal.com/assets/userfiles/files/69172716738.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c425d4da5---19479205660.pdf
    • https://thefertilizerproductionline.com/d/files/gezebulasobo.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161361bf50be2a---12177444973.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=movie+playbox+apk+2020
    • 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_off0000ae0b.bin
13a800a52e77882b2a7171c95269edab2349a262e21bdf63ff4f96801d703091
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0B 15748 bytes
font_01_sfnt_off0000d4f8.bin
66b7af1c463e3423d8f2bfe2cfdbd5c8dc3e5e1fcf3450381a843a786a959b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 10524 bytes
font_02_sfnt_off0000ecdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes