Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba601650723e04aa…

MALICIOUS

PDF

73.5 KB Created: 2021-06-28 16:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d374cbd5ad2b5557d59f9f20b036219 SHA-1: e75e90fa89ef505bc21c9ddb26abfc3f5af7c791 SHA-256: ba601650723e04aa5b1380a32e1774de1f61ee51735b0155e31f53bdb4eccdac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to lead users to malicious sites. The file's structure and numerous links indicate a link farm intended for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://irlanc.ru/uplcv?utm_term=frankie+and+augie
    • http://geose.ru/userfiles/file/mibuximikiwibajexak.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/82asttrojfi9k1h8eau9ep8or6/25598272666.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b841611b3e---9465444784.pdf
    • http://geometrarontani.it/userfiles/files/gukelunevebuxa.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7a7adf5f68dde03cad337754001f57cf/53966767996.pdf
    • https://botorka.ro/userfiles/file/65676935209.pdf
    • http://ipllaser.in/uploads/959076819.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/n6vu2km2qgoj7ut180rr6ep3f4/nusejatoseb.pdf
    • http://htwy.com/upload/file/jagexox.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c62cf4d2b43---84908711500.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6340206307---gufezesutisitet.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210605_56F89725FE218E7B.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070118b2d02f---dalovi.pdf
    • http://zge-led.com/luodan/images/userfiles/file/kexedizeminasopujatukub.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sr0un9qiffmv1ue8tb79v3u782/rejidalobotiloxalizogenu.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec11aa04c1---dotikapel.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/d96bce26bbb36884f82ea706cdfd24a0/mawuwim.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0912953948bf2730f5a33687a4b28bf3/samatakido.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i08g04iidphrs4ah37ufdgmiov/503773398.pdf
    • http://arkystudio.eu/userfiles/files/84211713781.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7c84128454624753cd04dd45009c2883/86665067983.pdf
    • 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_off0000bebb.bin
b5b56a01a55a591f0398ff331c4e6bc440a9144313182995859a8b9980b0ced4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 10160 bytes
font_01_sfnt_off0000d538.bin
186107fe37268afcc70690ee133ebe03bdbadd36d0d1a0c3b625fcd901790ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 16852 bytes
font_02_sfnt_off0001011f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 16792 bytes