Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb75a31db4a42e84…

MALICIOUS

PDF

74.4 KB Created: 2021-07-03 13:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eddbff5ac7e1c5291b4a07e9056ff4ae SHA-1: 29dfeef22c683f134c5c4ac60fb44652671d83fb SHA-256: fb75a31db4a42e844547ce0c83df842e503be097f122e8755b5b11c1bff41235
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608339b20125b---12119009276.pdf
    • http://deltastal.ru/userfiles/file/manipufewirapo.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609225d9898c0---32881215033.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/nuzulowevujibigopasalixaj.pdf
    • http://terezmisszio.eu/files/file/besamunok.pdf
    • http://dermaktif.com/imgup/file/93233196857.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210606074437.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b891cc766843c1070aaee9cac8fecca1/74300433214.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ee783521---90910322763.pdf
    • http://guowangcable.com/d/files/93597219387.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ced823e6a---bifewujarefogus.pdf
    • https://tedvandergulik.nl/userimages/file/77907400670.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/21514039919.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ee568251070a18587af1251b9971dbe2/9544805812.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c476cc769f9---zamuki.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1f03a556156274003067eff1dc6ea707/52539019205.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e99db701---390233449.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c53c331a5---4002032614.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/84d5f36d50b1ffa095d4e0cb5702ce5c/bekoxafozalatusenudevuk.pdf
    • http://pressvaluation.net/userfiles/file/pumedowojuvebumuwuxarevog.pdf
    • http://landia-print.com/pdir/file/tubaza.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3ef36ee27550864420de76692ec82d9/vofedonapape.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c229a4cd70c---zigir.pdf
    • https://hotelmitrutarija.com/uploaded/files/labupurotine.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a740346b3---rofusibidira.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=no+one+is+like+you+quotes
    • 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_off0000c196.bin
807aaaa843703c865d7e993afe45d4b3a19c3c339047ba19e34ad2c645aabafa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 16892 bytes
font_01_sfnt_off0000ecd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 16792 bytes
font_02_sfnt_off000104ea.bin
68232e8289343492832dd6c6ff83cb1cdf162ba7c3a7891be2b78d7e92bb0ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 10268 bytes