Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3ff5645b9cbbeb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 23:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89b0679bdfdbe1d54c0044eec893630f SHA-1: 7a3366d8e3d2fda57666382be6776815297221d7 SHA-256: 9f3ff5645b9cbbeb36c3f57fd83f53c69c704a50f27a726fe219cb78a6a012bf
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/mupegafelutilefopawi.pdf In PDF document text
    • http://associatedreclaimed.com/userfiles/files/84079393182.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/ganelu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/fae419afa2db74aff0ea4aaa9dd05bda/xibukutevademitegalawimiv.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/rovopepajo.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4e16129c76d752b1167f17f7b5fbc963/70268377692.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8b749293---gofabepomafeguz.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8235e5722681d95971fe3556a460d395/gelamavula.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/gukuze.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9fb8111dc82ad734a3f18893e7afc534/vumavawulesafu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/71017979925.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/mitotesivego.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/40002757326.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/54245980731.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/fuvofasofatunukilo.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/19840982069.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16121f18b2d6f2---79874411749.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e12ddcd04---visudemizirinunurili.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/zazisotamuven.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/62813494311.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/befonujulolapewomif.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/zisoger.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/42712939738.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4f85f7cf---30329530543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anti+asthmatic+agents+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 10784 bytes
SHA-256: 14a9c8d86c01117457b148549b503516cd231f8359ea46aac58d4ef23793add2
font_02_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16804 bytes
SHA-256: eed7ab462683b521da8a1bbc4121f2b49d8ee1ee8bff3155e690508e62938933