Malicious PDF — malware analysis report

Static analysis result for SHA-256 1973e6f452043f2f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 21:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d1073fc05e6c1b29c0367a37ebf0a97 SHA-1: 537f2875afe0386c3b8d6e058d0b4ef3674749ab SHA-256: 1973e6f452043f2fcc77a1db8d794e5ed880286179c29db5523d903e937dcac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aep-tc.com/cache/fck_files/file/74936818563.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6b8e13765a0c85bacd964da9ba9d88ad/21586438825.pdf
    • http://tw-go.org/files/39740475723.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6e871028f6f2a86cf46c64e291765cdd/ragukejadivovup.pdf
    • http://watthaistuttgart.de/userfiles/file/manuwutanijisowewefozed.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16220290285221.pdf
    • http://chanakol.com/ckfinder/userfiles/files/gozubajexal.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/a80f687c5a426fcb726daa1bc8130a0b/36590190097.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1db465d2---rudumozed.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9c57mk73jhnkqpuefeoakeelb5/54182815548.pdf
    • http://yesilderecine.com/admin/editor_resim/file/terewilelagovadekedadope.pdf
    • http://dwhs79.com/clients/15834/File/48035320184.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160702f833083d---38367564502.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf5d721d4---19996549441.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d064dbc29---74630935762.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d07c4e45---tonebomovikopum.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/329f9fec59f929589e6c8c07cac7f51f/lonugevazewazenivuzezozig.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/38291017b9e6ce3be0df3947b27bde02/57883034932.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160761af3842b8---53944168026.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af024db36---97213948337.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/14892823479.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/vevukufajoxurised.pdf
    • http://barsugo.com/ckfinder/userfiles/files/dopujovuxolasem.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ibp9pio8mgsegk0i3r4pklt3a6/jikewinimokewa.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfd3c75a5---84408230064.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=another+name+for+respect
    • 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_off0000ec02.bin
ac35dbc06547fa493dab2ada2dab6fdd4d7108074dea6339475899e1fd3488e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 10588 bytes
font_01_sfnt_off0001040f.bin
df6b3630e92eb66f2ae649696fcbdc8a275ba927a2bc0b28dcc2a978b323ae92
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 16824 bytes
font_02_sfnt_off00012f9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 16792 bytes