Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e7e1bf360d3662…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 05:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7de5b09e4ab0a8e319bd7466d2ab6bce SHA-1: e2b7e4b18253a5fc9c061df8b0962100be854f24 SHA-256: c3e7e1bf360d366246f46e8d439be8ac1f110752171d351d38481de21ed36e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942a65cdfc9---lakas.pdf
    • http://tecresconsolidamentorestauro.it/fck_data/file/kewabenuv.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d9ce0789---19298555432.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d7da4558b---jugifu.pdf
    • http://alexhoffordphotography.com/temp/files/file/55340934361.pdf
    • https://turkihale.com/userfiles/file/zumukijuluvifitegavejav.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1d2af65307b596e572870add8e45954d/vovilewojujuvojuwele.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/xexewasotijatoribedizi.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/79791780437.pdf
    • http://papinchess.ru/userfiles/file/25875685182.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ab7f09039050148754fa967c8ddc3a72/44185899769.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0djgihn5oq71erbe0poq647uvn/nerimemogaxolobapo.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b4222f76de37abf0fce6fdc4d60278c9/97781448581.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/775802dfc85dccd4d3c30664598a2cc6/xudovajaj.pdf
    • https://btegypt.comfile/5195628071.pdf
    • https://nbcmedia.vn/ckfinder/userfiles/files/20063091238.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e916bd0fc92e90057b0586984a76dff8/26069445279.pdf
    • https://istanajpdua.com/contents//files/renejufizikapovazasev.pdf
    • https://appfacile.it/file/tegorutoriwixalipis.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842aef5b312---89293668673.pdf
    • https://invest.pl/userfiles/file/38961092171.pdf
    • https://schmitz.cz/res/file/movop.pdf
    • http://allycatering.com/userfiles/bupiwurebep.pdf
    • https://turbooto.vn/upload/files/nulekabixasugi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+save+word+2007+file+as+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e572.bin
338052b95443e2e7232c9994c4e684c3fd528bf768157730383160e799cfc912
pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10820 bytes
font_01_sfnt_off0000fea0.bin
00512c401f908e609a949f9fc50b28c4346b5574ea4e6dc2ff033f13b1ab5b15
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 16456 bytes
font_02_sfnt_off00012955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 16792 bytes
font_03_sfnt_off00014162.bin
0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
pdf-font-stream PDF embedded font (sfnt) at offset 0x14162 1668 bytes