Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a660532c7341ec1…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff2aa30f9f466522c89e6a159774b0bf SHA-1: cb5e600777d542f147d9258b1fe0f7439fa6c2a6 SHA-256: 1a660532c7341ec1a45304d55659e71e80c01ef256db80a185319685fc283148
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/5g603rs3nb5v282l5c3kvh09h5/71088836919.pdf
    • https://artbynela.com/uploads/file/96740604418.pdf
    • http://www.amedna.com/userfiles/files/faliwusuwatiniludesuf.pdf
    • http://amphorabeautyclub.com/campannas/file/92947030012.pdf
    • http://alnoorcity.com/userfiles/file/64155130027.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab271d1a11---pozadipotuzorivutoku.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922bb9d4bf3---13766205337.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/rijarozi.pdf
    • https://vestol.bg/files/file/7683284911.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/08c847d9fdd0b0ac6957c1293780128e/bolapetu.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9df33763---90926797961.pdf
    • http://hgbs.de/userfiles/file/38661832906.pdf
    • https://amrapalispot.com/userfiles/file/raxilisotivuva.pdf
    • http://ampletrekking.com/userfiles/file/losaxirezitoxuwomorikonur.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b4ed9b9e---fekeka.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/6mc2f3l6urgq17doc3svtnerbc/pageriropurizeworejaxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lord+give+me+strength+to+face+my+problems
    • 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_off0000fb1e.bin
40541550fb2d87842b447ef5b12ad87df857003b47c0d24b62956a7397fd9ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 11344 bytes
font_01_sfnt_off00011540.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 16792 bytes
font_02_sfnt_off00012d52.bin
b48621f8537535cb1139982adcb4649d55852dc915f39e5ebefa8706f557405f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 16796 bytes

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