Malicious PDF — malware analysis report

Static analysis result for SHA-256 06163a400d226254…

MALICIOUS

PDF

76.6 KB Created: 2021-07-08 00:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c542c185e46cf2a4792c9174d949aa6 SHA-1: 350fba3520366ea02900423e7117d3a197acfa3d SHA-256: 06163a400d226254fd3e2e47f7605b7435e915938b16c06d91eacba7edbd967c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised CMS upload directories, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and numerous unknown reputation URLs are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b4d76710---44295103543.pdf
    • https://abofahed.com/userfiles/file/3036916076.pdf
    • http://shreejians.com/userfiles/file/47690373204.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae1d0b087---40584198846.pdf
    • http://ji-tien.com/userfiles/file/8474105483.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9933234702---53636469535.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215211537173922.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f5b520c---72557562417.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/31a6c6f0c6842ef1f0da7fb8e803ecf1/pinopemiwapaka.pdf
    • http://cloverpark1959.com/clients/51168/File/90933122815.pdf
    • http://csc025.com/userfiles/file/20210628123344_99kydz.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/et383i86qv3ot3352pq92b1et0/lasadudebapezamufarogug.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a024d2c6306---renotedolebuxamezapujof.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5b131ee6---rijozozinijiluvisudowapun.pdf
    • http://arslanemlak.come/file/doturirusaru.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863e52ef50f---2424925158.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5080d9fb2b---59151511196.pdf
    • http://frutapac.com/ckfinder/userfiles/files/30352190673.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c976570b74---nijazumenusegix.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160885c986dfab---kodiporuzuwawujep.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/94650516665.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d39ebafce4539e0a9d89108ab17d1809/17423756777.pdf
    • https://betenagro.com/sites/default/files/file/buwilorumafuzobu.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ro3kei97f6hdfmduhf2pae19f2/nirur.pdf
    • http://abacusnancy.com/userfiles/file/xuvalutipuduvasono.pdf
    • http://apsara.ru/userfiles/file/nifuwetifukaxemipepon.pdf
    • http://abpaluso.com/upload/file/momuwisirorev.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b764434c74---powavoxobanexumenuri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=10th+practical+book
    • 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_off0000c925.bin
250f7d6ca45c78f33c619d27a47c0b522aa5376085cc3266fb184793238888e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 10376 bytes
font_01_sfnt_off0000e079.bin
f7d3a784b2b1565948033ccaac3cdb37ae1c6e3484c7ad7ffa134ba6a87ad253
pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 17076 bytes
font_02_sfnt_off00010d0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 16792 bytes