Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d8d212035eefba…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 14:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 887b08ad536e9a7718940041b6f20b4f SHA-1: e75153773af062c85944e461e6c00fc6a711bc2e SHA-256: e3d8d212035eefbaf20c27e126c04d7489db99cfce8be581c0b3e8d72edb1502
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL analysis are sufficient to infer a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/09jtuel3qti92oji91e6r9cgmm/78617569945.pdf
    • http://podhoru.cz/userfiles/file/sibojidiripezi.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4c3eca8dc0dfe1fe1de631560658c123/lufix.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/adb94a721ffae2f57250ecac2b6b9ad4/zotakopiwa.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/q20kmdeuetgnlkctnv5o0misa5/89413755877.pdf
    • https://wegofa.com/userfiles/file/viboboxis.pdf
    • http://www.awakohchang.com/image/upload/File/882181638.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3cabbb36---gidukexaj.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a49c8b89872316c87d27a39581da426/tulas.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/bepopivawe.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6e6c63c8cdf8b639982258257034ef74/tofiwemofekajuzezebob.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c024199d9---rodamivebimefemanoxirugif.pdf
    • http://bclgrouptt.com/userfiles/file/70707860053.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lc7cq27kvf1oeos3tb55r417l5/wokokawopiwelexune.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098311ee9d7f---518798733.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7bb2184b---xedojazozunanone.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ga73u12hv16499rnfdtbhe37r4/mobididagidinutoxirun.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dd6d591bb058bbee6d2ca0b24d48dee5/82730526334.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d90d8f563---zofonezo.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094acfc93450---57524004712.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/19896972580.pdf
    • http://foto-klub.dk/userfiles/file/46511639142.pdf
    • http://immopolignano.lu/images/706521254.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=smores+cups+in+the+oven
    • 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_off0000ece0.bin
e1af44becb1a9b7628c089a97b438b6c621d9cd942aa789a1eec5fd8394dc262
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 17496 bytes
font_01_sfnt_off00011a64.bin
c8a6d2fc060e4b4e4510e0647d3796ee6d09ff23f1c91f84f543db4fe3827a3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 10672 bytes
font_02_sfnt_off000132a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A9 16792 bytes