Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d03b1dae3d1950…

MALICIOUS

PDF

102.3 KB Created: 2021-09-04 17:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8391024d0d864dd10fd12325955fa4c6 SHA-1: fb176118f3f19a4babc91cb8f15a787597a7736c SHA-256: 59d03b1dae3d1950ea9277001b8a691b6eb4c652d79246d974ba5abf35e9e0ce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms on disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o81rjic5jqd2l63t1fsbm8osve/92503686047.pdf
    • http://hgbs.de/userfiles/file/wisebagexatasesodofux.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e933121ca---35022207995.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/161087f7968296---kemefovasodixeban.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3a54363d---11355760872.pdf
    • https://jamurgoreng.net/contents//files/bezited.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9528988f8606df2ec69aba035ebdf6ca/25074352631.pdf
    • http://lesmashclub.com/imgUpload/files/74266372232.pdf
    • https://gsm.company/ckfinder/userfiles/files/4280013991.pdf
    • http://castrolmintabolt.hu/images/upload/file/30303361251.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/21673077460.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a615a3a27---luleviwititufukatekivok.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/fb419dfcca30fde0889599cbad09175f/jevorol.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/efae1a51b6e99439dec14fb0950fade3/sunopubasetarusino.pdf
    • http://svenskafik.se/uploads/fckeditor/file/49938852812.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eaf45b02e---59950314151.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/59828923154.pdf
    • http://axiomestates.com/userfiles/file/98098764217.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/vuvot.pdf
    • http://portalcom-b2b.es/img/user///file/_0630003001619913642.pdf
    • http://studiotecnicolari.it/userfiles/files/wujeduvimesifipu.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/22147917159.pdf
    • http://narcisse.sk/editor_uploads/files/15136923781.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d766cc67---25977090714.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084062c8377e---dolebemuzakuvixixodozagom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=digital+multimeter+use+pdf
    • 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_off00012968.bin
cd3e20d68aad735c0b61a2679c81d1e04651ff4710c1ae3475c225830b811e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 10720 bytes
font_01_sfnt_off000141d1.bin
a4c06a0089654d3d379eeab23044c70da5ba3f7bbac10437d863c11ceb34b61f
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 19312 bytes
font_02_sfnt_off00017340.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17340 16792 bytes