Malicious PDF — malware analysis report

Static analysis result for SHA-256 545739bddbc9ab9b…

MALICIOUS

PDF

139.9 KB Created: 2021-06-28 22:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8d7ab25d860011df998d1a4e03d0d48 SHA-1: 43245cbf949ff0eab2776edbb14a0e96c7be68e2 SHA-256: 545739bddbc9ab9bbfaaf74b41e171b8c2aa736eabebf483b485711092acaa6c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and URL analysis point to a link farm designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://vinag7furniture.com/app/webroot/files/editor_upload/files/foxidap.pdf
    • http://lobanowscy.pl/userfiles/file/11178523452.pdf
    • http://capri.lt/userfiles/files/76540054449.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc932c934---pagipuwosejugatupa.pdf
    • http://africareview.in/userfiles/file/72756078366.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb8078f828---poliwuw.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/37725569178.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cf27312f---vefewotuwubaraneni.pdf
    • http://straub-online.ch/userfiles/files/99152947636.pdf
    • https://daynexweb.com/upload/ckfinder/files/munejemofevafegakovim.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a3dd325c---43849740312.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ra525nmkr9kklu4dgs6ne2sau/jixuvepoguz.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b81737e28---vumenunuxiwirepef.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ddb0de9e---66730034045.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7a1ab025ec3ed3a69ec06eadf7a7ff9d/67240809734.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8324b3f1d---11081603607.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/59128878261.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/aafff71e620afccd3d9d716a4f58c301/10796827184.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8240b01439---fejefotovijanoduxenalu.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2c1e971ecaf3081300a2cea27cad3a59/86483176779.pdf
    • http://ankaser.com/userfiles/file/37440635759.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e4028737c2ecb3b0236998105632abc2/44530691193.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce11fee05d---mubika.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/uhsl4lleh818mssctk38h75thg/retulexelug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=linux+hardening+guide
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/13ee662fd0bc65bcc3a3680f946e421e/xegabexobomep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c3db.bin
e129c64d5d83d90c2bcab2cc86945769aa44dc109f321be25983d24db384f04f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3DB 10252 bytes
font_01_sfnt_off0001da89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA89 16792 bytes
font_02_sfnt_off0001f29b.bin
7dac56d1f2c1e168f03855d7c80e81ac3362873bdb47c1c660e0aaaef1d5877f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F29B 17996 bytes