Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8aad0e4114cb81…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 23:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec6b02ebad86e32ca413b77835829fd SHA-1: adb769cdfd572eb3b6707b5a674d00eb76b4ddec SHA-256: da8aad0e4114cb81109864f4ad709d5d2923a94b7631badc7793ea72354879b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6d17221c711d754aa80e8264c4efe445/15575134680.pdf
    • http://best-infosystems.com/userfiles/file/37135882585.pdf
    • http://alliance-ltd.com/userfiles/60046856479.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdff1f9355c---11358684134.pdf
    • http://immobilieninvestors.de/userfiles/file/9422601182.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fe7c4a64---jexitulajamodogatod.pdf
    • http://abwferrellpkwy.com/uploads/files/mijifid.pdf
    • https://cplastik.com/data/cms/file/terelesil.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pfm0tcdf2vg2rahbic3euok12i/44712273602.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cabb953623cbdfa01b57c332e6b2801c/fuwatukirem.pdf
    • http://www.gabrielamaciel.net/images/content/file/zevapekulegapilomosubiba.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/60221673148.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0807c92f---70125966322.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7b6775fe32a8eed96981e0ac584ac585/fijuxuxoxovege.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160886082835d6---rabulokefe.pdf
    • http://afslab.asia/upload/files/ripabobuxivawo.pdf
    • https://synersys.fr/contenu/file/25691951440.pdf
    • https://nbtele.com/en/cache/fck_files/file/50584741770.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160721d5d2d3c9---90910156501.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/da6f8a65265152bea46387474772cfb0/jodoza.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/p7m2i19pt26eankb75o13jfch8/91815308496.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/96965713014.pdf
    • http://softwarefactory.nl/images/file/75822236321.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=icd+10+code+for+pain+in+right+buttock
    • 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_off0000f4ed.bin
870fd1479a7607abe0c685c45eb5e1c4d98018269157f49d20f55a46815d1a82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 17628 bytes
font_01_sfnt_off00012314.bin
cf8e8ddeb772358715e5d40e4af518e40d6cdf207242bc318f55cd59f41ca681
pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 11140 bytes
font_02_sfnt_off00013ca5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA5 16792 bytes