Malicious PDF — malware analysis report

Static analysis result for SHA-256 d825b07152cf88bd…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 17:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dffc19a49052b9eb94cc23ba75b2686c SHA-1: c690f2292a6b983a83d9ec2557cd048b10dcb54b SHA-256: d825b07152cf88bd8ec8a84eede54b12d462b9d8fe6225da5b91d2732ca21f42
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple PDF files hosted on potentially compromised CMS uploads, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://brilliantsolarpaneling.com/userfiles/file/45075600250.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/556814db8dd583f740a3dd904266829d/82838433875.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/20074316a72391f4fa336bccac3ed06c/puxomoposewotozuge.pdf
    • http://drapa-technika.cz/UserFiles/File/88520580303.pdf
    • http://andlupa.com/userfiles/file/98292025915.pdf
    • https://journeywithmypet.com/ckfinder/userfiles/files/85316435124.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/2n01lrpqa1t8p13pa7b80ltbr0/liwikekap.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/29ccc03a2a1dbfc7124ec6cd2917142e/jabadutuwodibonofimovip.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/29eh1b3khoc83m9kmglhvtssif/7387189719.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079882d04bc8---6480357757.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/tujovozon.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23701607833.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc1574112---dimifipofalegu.pdf
    • http://vce34.ru/attachments/file/pimabezokomapezufipaf.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0rfebmc1guaufghe9f1ksarujj/lujerewiwudugebozuz.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f6595526ec1ae86d80f73f91982a0b9c/92402499250.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/557661e441df855274168316e1e23b5a/62291881245.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609225a406124---72589190911.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de379c27e64---zarozadakedovapefuvofapen.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c504c5a5035---petezadigelijogakaziwilel.pdf
    • http://hillandbrownfamily.com/clients/76964/File/kizibelogaxabebug.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2721c6ccf---sutifojunonojazeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=assuming+makes+an+ass+out+of+you+and+me
    • 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_off0000f6e8.bin
9b0b81904f862627d8b583c8e9e2f387b9d9972b0f9ec2e96dbf69445ba77c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 17328 bytes
font_01_sfnt_off0001241d.bin
58a7bc0e96c3649f80f24b34ddf7b83993152c1d6c20593061849098bbfec391
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 10836 bytes
font_02_sfnt_off00013d00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D00 16792 bytes