Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fb632e2d6d8b55…

MALICIOUS

PDF

87.8 KB Created: 2021-08-14 15:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e834baeb6cdc8c697c147b594c5a1a1 SHA-1: f6a461a260983742d678bd8b72c5aa433102a103 SHA-256: a7fb632e2d6d8b55768fc49cfd6d4ba160282d63f3d0b6f57d157f3a16296d7d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of 'utm_term=run+android+on+linux+pc' in one URL suggests a potential lure related to running Android on a PC, which could be a pretext for a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://olsztyntransportmedyczny.pl/userfiles/file/79106581318.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5480c91015---bibepidagubezuku.pdf
    • http://soflocops.net/clients/81266/File/medukabujoz.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfjrfgglhn3rjq9349ga0u2tnu/gozadamejosamijixezakawo.pdf
    • https://almentispharma.com/ckfinder/userfiles/files/25130153036.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/56387704474.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f3d305e09c0ef9e0c277c729ca712659/tawabugoruwilamo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g0lh89e0ir34u27v2lk2enp8pt/31298575914.pdf
    • https://sasalidayanisma.org/uploads/file/71596570127.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160700ca49be98---lefigofijutesuto.pdf
    • http://reikihaus.com/clients/75291/File/47377412659.pdf
    • http://pospatrans.cz/UserFiles/File/kigatuzag.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c0e9e7f5---lupup.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dfb5685193070128ab30ca2d2aaf6d67/89389218992.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7a3f0175257270df7e13fe8fc1846d28/telubu.pdf
    • http://masan315.net/board/imagefile/file/lutamufilexog.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3c9f2f1ec---70216160361.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/bevufebexe.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/t04lr68mri7fuugaqqsjau7a61/44874076866.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6193c0563---89899527575.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/32316122951.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b99bc3671---84741015648.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ifl5v7q57jpo0104a6u5kvb7l4/vivopabofanumefowewuseb.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf828c3ecd---1402904227.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=run+android+on+linux+pc
    • 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_off0000f2b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 16792 bytes
font_01_sfnt_off00010ac6.bin
1010d8ecb146a69d42014d252a91b2efb854ebba64e7b8eeabdcd572be4564b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 18516 bytes
font_02_sfnt_off00013a16.bin
4b9a3671184b636bc122cdebca43ffdd98d6c5c8a2c32b0f15775fa291c66340
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 10356 bytes