Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2335dcb1bc7ed1…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 18:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd0b7979934a4769fdabf2479ae7997f SHA-1: ae8cecfb66e1be3394d4d1d03b7166a937542af5 SHA-256: bd2335dcb1bc7ed133c42c1c9da6fcfc3cebd1ac3683080a8f0566e11be40d2f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://katachizu.com/img/news/files/pazinelufe.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa062d006---20328310716.pdf
    • https://empirepin.com/calisma2/files/uploads/90878288757.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/vugekapokuvotoxetagat.pdf
    • http://garderoba.sk/images/_file/28583117365.pdf
    • http://resetimpianti.it/reset/public/file/94302755712.pdf
    • http://scales-center.com/shop/fck_file/file/vegudavuramamodigu.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/39138355286.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a91cf1728321381255fc00e00e436d43/wunajikalutovuba.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c096f2b5f8768b0b2348ea7f80da49e8/7557500787.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a501bc72a0c---29717734654.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/sijuwiz.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/be5afb1c13b7bef1f92528170dfa41a8/11114565551.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6a12740d---39713020318.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608763b47fbac---momiwadiduj.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/51198652471.pdf
    • https://villatoscana-pi.it/userfiles/file/zuvekovonivuguvepasurox.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/br0t4cga53teuj09lujgr7n336/wafitalego.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9a239cef---10975578439.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/e0j0vt6811lckm44ntgtuepipm/xijuzixefiduzu.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7fb10c61---64740467163.pdf
    • http://www.nomorcantikspesial.com/file/kofagev.pdf
    • http://alwaditrading.com/userfiles/files/55416733939.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+left+leg+is+tingling
    • 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_off0000f206.bin
ee10d677dd6f087ae6dd6b4dceefc7bc9fbd548ec6e4b91e631143418e53593e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10116 bytes
font_01_sfnt_off000108b7.bin
9e73346bd7c126b090dec6894fb2cdbedb65130cdc5b1cfe498ce10925f175e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 17008 bytes
font_02_sfnt_off00013460.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 16792 bytes