Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa87e5e1fef08e90…

MALICIOUS

PDF

85.0 KB Created: 2021-06-28 08:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 441c1122710f4f10e3426c209e8bee1f SHA-1: 789d3c1909066c502b1faf9d4d6725918aa0d6e7 SHA-256: fa87e5e1fef08e903e14cddf1f0281ca49aecbc5c13277e6b52fcdec31ecdf31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were directly extracted, the PDF structure and heuristic findings suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/o8b3kmprmkm0c4c9t63mcd2rv3/zutexajufalozopopamipeba.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e26aca89e---piwonu.pdf
    • https://liniagdanskzydowo.pl/files/rikil.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/90148cb1a91722e6f4077632357123e6/26182456347.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080130e4e4cc---namogosesenatezunosodobi.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160913a2a4af9f---23779201310.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b1b6594b---94223549912.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210623_DBCDDD102C626ECA.pdf
    • http://bluecars.pl/userfiles/file/patafed.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e524f8ae---pemufilogodomujudesirojiv.pdf
    • http://akkoryazilim.com/userfiles/file/zawubibatudiw.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/srfojseklpdqhrlougnbd90i9g/boroja.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dtbsnlnbd5k12aqsldfi5a8hh6/30888563359.pdf
    • http://extracam.es/app/webroot/arxius/file/76811814419.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160945c693d0d0---96838745238.pdf
    • http://hopkinshigh1988.com/clients/75739/File/gejifuvapijivegetebov.pdf
    • http://absolutelyneon.com/userfiles/file/21055104497.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/688834ddd0ca6255d33f7827f05d3b21/67959076202.pdf
    • http://cosmic-kino.ru/sadm_files/rasosizujoxabufefu.pdf
    • https://auto826.com/uploads/files/mepebemopuwumawev.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/aef0b455b80bd943f1356e0ef810f277/fetojutomakitikefuwunajik.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/ratimafuwag.pdf
    • http://synthecinter.com/userfiles/files/6521621010.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=action+words+starting+with+i
    • 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_off0000eb69.bin
ed8ad11b6130688ee83941a59f8852b97bf3ffd6baac032bc06d92aa4bc489e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 16304 bytes
font_01_sfnt_off00011566.bin
b4f11c2ad88425c95ae0fa5ddddc17216b561497e60782cb83dbc66c222f2b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 10536 bytes
font_02_sfnt_off00012d39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16792 bytes