Malicious PDF — malware analysis report

Static analysis result for SHA-256 a916d291408031f8…

MALICIOUS

PDF

85.8 KB Created: 2021-07-03 01:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb4984568d552ebb6b02aa3c9eebc382 SHA-1: 489e52cd90b50a8784c7ce46323bf28c0b3f781a SHA-256: a916d291408031f8ffd3ea0492e1da91f905c5405bc323b2901924f2081cbde9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=the+hot+yoga+factory
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856eb73f0d2---jovuvan.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/345564445.pdf
    • http://avsa.org/sites/default/files/images/files/wigozitebikazomum.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d777be5e33---gelovujidimiduxotupebovi.pdf
    • http://614move.com/clients/4890/File/82635845410.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd009c486af---vijuwijib.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xupekasa.pdf
    • http://alphasigmaoverseas.com/userfiles/file/29365289634.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ba579f9f---3909800683.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210613_C4D7BAF5715C66E3.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6ab48c07---tariwilafepuxetitonim.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607176dba350f---98178227452.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3c31911bf5ddfafe74e37f73944e8af4/kafevisorepux.pdf
    • http://chronicles.ae/userfiles/files/zudogetareduxijugozidev.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fd8426ebb8b6f1a36eec9a4cab00110b/zitufevatoduwubon.pdf
    • http://twothirdsmajority.us/clients/38522/File/xukiwidufuwesagup.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/figep.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a81c2c6c65c8d973435fdc8c1195ae16/mesoguketazogug.pdf
    • http://mextro.de/upload/files/36806232551.pdf
    • https://iwnta.com/userfiles/file/49297487548.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd092e6dd94---taterisadozoburekamojip.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810682b03ef---1950027026.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_off0000eb18.bin
6ef2e274dbcadd4dfd071b44c2d120acae3f3509f34a858053b3780edb9bd2a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 10280 bytes
font_01_sfnt_off00010279.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes
font_02_sfnt_off00011a8b.bin
0d76a29f59275f3d87813418599972b02c49c4e8e4e71cad3869da406f91eed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 17564 bytes