Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8538437e326c54…

MALICIOUS

PDF

97.2 KB Created: 2021-08-19 00:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf654cee93d7394a468909c0c2b2a51e SHA-1: 98e9822da1ee640114b0c392929ebdb06c1faf8a SHA-256: 6c8538437e326c54532710c0b1a1bb32cedfe2d69d540d81da711b5e366c7d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The primary purpose seems to be directing users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://hanasushimenifee.com/uploads/files/zowoxoxogiburizinobom.pdf
    • http://www.bufolari.com/public/immagini/file/26514149855.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6173db32---35299057828.pdf
    • http://lifecare4all.com/upload/files/6202709061.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dedb308d7---lofilijiz.pdf
    • https://intrigantka.ru/images/userfiles/file/zojaserotadeduxi.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f02e032c13c---75496805980.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6816ef4d751a339a31e5badb17c36d42/vumaxokesamafoseke.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/deb08e924215c3dc645b79f0ee29db3f/didiwozimupapuwono.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072893b0581b---beloxanalasaforugumupuka.pdf
    • http://tetedebois.it/admin/file/54819909822.pdf
    • https://lasanisports.com/files/fisej.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c63j61r8gt61im5911oeijj395/buxix.pdf
    • http://hzjksj.com/images/upload/File/75140213426.pdf
    • https://palezieux.com/ckfinder/userfiles/files/92010452039.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4947431a56443845d0b4b3dff3836e39/jemaganadedogena.pdf
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/gokiwalobe.pdf
    • https://airshow-bg.com/file/xipukikivunimibafadok.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88092cc71---68613239364.pdf
    • https://koncnc.com/genelresimler/file/lujidakamukisafidikatava.pdf
    • http://anpharma.net/upload/files/85694951985.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/92350841373.pdf
    • http://openendrep.com/userfiles/files/nesakafuxesufoxaxuximixar.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db5fabc6ecf---63689452283.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1a69b676---61706435199.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116184ec86c2---jutus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=le+mythe+d%27icare+signification
    • 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_off00011414.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
font_01_sfnt_off00012c26.bin
131a9c1a5ea23d6e85dc744a58b49ff3e51e496f3b92a637f9c2b1b6e285dd7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 18872 bytes
font_02_sfnt_off00015b2e.bin
805aac3cee04a4374302fd024b2e860d8da9e70573d44f244786d479f4cd2686
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2E 10980 bytes