Malicious PDF — malware analysis report

Static analysis result for SHA-256 46440a33acf2c14a…

MALICIOUS

PDF

81.5 KB Created: 2021-08-07 20:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e573d02c1286a2852421f75433c91367 SHA-1: fbde82b45a0fa813ef51aa0a3bc61d8bef045028 SHA-256: 46440a33acf2c14a76f443873fb28e655c6b2df2520f2f4c82733b46d0c94cdf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/434cf33225cc109610f2f2d1043482c1/24737332805.pdf
    • http://dharmapremipariwar.org/userfiles/file/31377985596.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3e58c06081b30f2e76b7dafc3004a89c/rigamirupir.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/75307669439.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07842dde7333a043ac525c0fc7404931/tibozasekunadirozetorosen.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4idr96m2atr21oadodn3m31a22/81168210405.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9bd3d0fb1e7bb20c980141fe4b27d45d/43528753601.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4lro8aa8vccociug88pjgdegds/54891823192.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c79267571239a45f1ace9e7670917194/juziziz.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609262f56a0d7---natovovi.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/18272724007.pdf
    • http://adamlegal.com/userfiles/file/suwilurimumopi.pdf
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/24160574708.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160888a83a6612---dewavezijesawuf.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b9738be44635ad336fd21398dc5724ad/jewakonabilaz.pdf
    • http://nickels.design/ckfinder/userfiles/files/38723707643.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16081f43c72e9d---70277310333.pdf
    • https://minhkygroup.com/luutru/files/kafabu.pdf
    • http://whalesart.com/uploadfile/file///2021062608253457.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cd295e0f6c0---lezomulonozemed.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/nirokabuwunevuxedok.pdf
    • http://www.hgbehringer.de/img/files/files/tisatavawuxipuravoxifew.pdf
    • http://cpk.by/ckfinder/userfiles/files/86852352776.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/4468ed007f94c33d46f2857d7a96220e/71708995027.pdf
    • https://flyingfish-stay.com/userfiles/file/rigiwigupurexaguwuteriso.pdf
    • http://chretkinia.pl/userfiles/file/38284246192.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=1999+honda+shadow+1100+service+manual
    • 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_off0000d575.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 16792 bytes
font_01_sfnt_off0000ed87.bin
7b601e68286cc839f054761aba00857aef62873cc119f2e5b5961f106b41f9af
pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 17552 bytes
font_02_sfnt_off00011bcb.bin
219c0a0a4b17fb0e6e3d4370831a62716eeb3f25cc2c0912d34fcb9ad4a4ca57
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 11036 bytes