Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf023f183bf771fb…

MALICIOUS

PDF

86.2 KB Created: 2021-07-27 06:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9db830de8d39ed3753559e5886905b0 SHA-1: 509dc22ea0a359611894e225ce5766e033163c77 SHA-256: bf023f183bf771fb6a38390e9274a28db1729a265add97d295abc406071c4b7f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bioscipublisher.com/files/upfiles/file/tujobekeletibopawim.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d59038014---35312869109.pdf
    • https://peterdegendt.be/file/tivaronawuledevifuson.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e6d04847---57213289389.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/59fe167980c1ada8506445de2b3fbb93/40354381802.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/290eccd38b6f5fdbc22fa1bd10df41be/burapebasupizariludeke.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hpkejgd4k8m9iu2fctodvrf5t6/nerot.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/c17fe8eaf6340aef2680658c16802fdd/91982689220.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/17leinrfgiqdi9359knnaqpe3o/punopojalalawigu.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7f8b6452d80896ce5a6b74e31726405c/pisapeloxuwibobuku.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087d58c58f2d---86438315806.pdf
    • http://lawfirm.vn/MINH/user_files/file/29451740953.pdf
    • http://massimomoroni.it/userfiles/files/tinizebepuvuno.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c181260115b---90960608905.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a9e2a29c0---bigivunebafo.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cf98fe85e68e7cd953cf798df33f2b3c/tuvavomoleruxadijosurumiz.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe8e95a7c7---miduvupiwebo.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c776c02f774---tinoxofekoxawosoxixawu.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/7t57aacen47vl73hbdumoapcjn/60072954704.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/lulovesifemuvatasi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/20ljsifqm1cupbn8pvch1d2c6h/71520625291.pdf
    • https://papersacksfactory.ae/images/bulk_images/files/61847815709.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453eda66d9---39979953367.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c47om6ng6klapafmvtk3trbh36/78809038188.pdf
    • https://littlelightnepal.org/userfiles/file/91387551044.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+hack+subway+surfers+easily
    • 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_off0000ea58.bin
6d095cf53c1d1040818ea35f9a46d83346b4f9fcd92186e4796ec2e87e1decbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 18048 bytes
font_01_sfnt_off00011948.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 16792 bytes
font_02_sfnt_off0001315f.bin
922356bd09eea8eef7f53c1a87231bff4d676e49d2973e9aff9f95afe1c0a3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 10852 bytes