Malicious PDF — malware analysis report

Static analysis result for SHA-256 0625aaf8e05209a7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 08:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f8057541d9e16fab52b2e0110eec95 SHA-1: cab9cd02402ba42b0f0c90ed681b2b552a66aa76 SHA-256: 0625aaf8e05209a764f5cd6317d4dbfa1ad9df33ce34dd3230b9e566d9ed6616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ietc-oman.com/userfiles/files/25352121952.pdf
    • https://novamakine.com/upload/ckfinder/files/vividaseki.pdf
    • http://hbtsap.com/Upfiles/news/file///23359830354.pdf
    • http://highlevel.pl/userfiles/file/fewezuxogekekepupuxele.pdf
    • https://jin-hung.com/userfiles/file/24110217546.pdf
    • https://cpc-serbia.org/js/files/15236818153.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395f557c8e3---44363294377.pdf
    • http://leeharringtonhomes.com/userfiles/file/pasolinusi.pdf
    • https://volnynaklad.cz/data/file/89302899377.pdf
    • http://atol-res.pl/uploads/file/jesumegopate.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/10161725376.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/kefakesokodikituxu.pdf
    • https://keralahappyjourney.com/ckfinder/userfiles/files/banefijisarerapejida.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///82850054840.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/gusigoxudo.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/93953814147.pdf
    • http://dallapietamarchisio.it/userfiles/files/1632008540.pdf
    • http://kfnmsz.com/upfolder/e/files/20210904015735.pdf
    • https://taptigrihnirman.com/singhania/downloads/file/vorebatokotigir.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3pe8bkecf0o6j5gk9rm48p5685/91922701419.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/puramevu.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139931ed4f9f---37796124484.pdf
    • https://2b3la571ga-70p.com/contents/files/fonifujuwesawaburiveboma.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=max2d+game+maker+tutorial
    • 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_off0000d3b9.bin
53ed9d253bd516dee4d01176090a4c52400c1e2abe841f65da8cf97a51aa0237
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 10724 bytes
font_01_sfnt_off0000ec3d.bin
d1339009d65c94ff6636a52d34e6158b2a2e67e21fc76e7856cf2c17d4df325e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 18272 bytes
font_02_sfnt_off00011b3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes