Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4dfe3ba8647f54…

MALICIOUS

PDF

94.0 KB Created: 2021-08-03 06:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a9f5725ddcc494a1d8c333782dead13 SHA-1: d0b545aa284e4c15cc097c16a04a657b06e11270 SHA-256: 1c4dfe3ba8647f5406d547c7e403f7edbcd811103ebe6d3150cef2d05888781e
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, specifically identified as a phishing trojan by ClamAV. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06947166d---fobejisadudup.pdf
    • https://actor-conseil.com/files/file/mekopojap.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37594915811.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/216893169.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/30352106773.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/94a84d0f2047d621574b54aa5d82ff57/neruvubidolapofisatigo.pdf
    • https://parkettworld.com/upload/files/14159637849.pdf
    • https://anfauglir.com/images/file/sugeg.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c603300151cb9641e428b5844a15375b/nexinewu.pdf
    • http://tuzlakart.com/files/karali.pdf
    • http://jjmcp.jp/userfiles/Image/file/70443195222.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/v4st5i4cf2af6quhpcff981p37/22417246577.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/dexojukifupuposofotoguw.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d218460f7a---62115189851.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/90273600529.pdf
    • http://siltherm.com/ckfinder/userfiles/files/tupalabomumuzefugoravi.pdf
    • http://wumag.pl/userfiles/file/78308880064.pdf
    • http://pileshoppen.dk/userfiles/file/golekizivukepuwe.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ad0d7d66---votevavemokupoxuwopa.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5s5qiqqt1ijcvq89oulksk50cr/zubitipebizenadus.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be40332f193---76620532055.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gehe8oj4saht0fv9rltch9gib1/bovimokenabivetaso.pdf
    • http://muacuoi.vn/Pictures/files/miduwirude.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/1dee22cfd37eabcfb67cbab78ccd147d/gofexe.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0v1ro36v77kv9lmplk1ln4ns02/jelezudexelofalakowe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dogar+books+for+navy+guide+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011171.bin
12ac771f871a90a5e9962db82f0a5de9981922ba3dd265028695eaa8bcb897a1
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11171 22040 bytes
font_00_sfnt_off0000e5f5.bin
dbf242081fd58d70443877f79c803a6dff6d2f9881fc23863484ccea0d38005d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 16756 bytes
font_02_sfnt_off000137da.bin
847fc8a5b74150427f603899234e869a525b470342430a36fd9f043cee119379
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 11032 bytes
font_03_sfnt_off0001517a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1517A 16792 bytes