Malicious PDF — malware analysis report

Static analysis result for SHA-256 592242c8f89aacd8…

MALICIOUS

PDF

78.1 KB Created: 2021-10-08 22:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 206da103771455bd5a3325806ac62aa1 SHA-1: 383bbbebb973d902758ac7e135f95322d1a8ffe7 SHA-256: 592242c8f89aacd8eb0d4263c75aec98bdd3ef17afeffd2ea372083e2a7ffdb8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, distributing links across multiple domains, many of which appear to be compromised or disposable hosting. The embedded URLs are the primary indicators of malicious activity, likely leading to phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=how+to+make+black+glass+panes PDF link annotation
    • http://energyexcess.com/userfiles/file/romelijeraj.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b8f38b75b---runowoziza.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///48544069257.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152ba4668a0a---zezipanapesi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/23b436d2c6186b8d4d230b2863afddaa/mexesijot.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/45583517595.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/tagepuxikajipinuputu.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/64798887834.pdfIn PDF document text
    • https://renteci.com/imagens/file/fuxifumoveribavejewavot.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/terovadixepavate.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210921_171735.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/4971774956.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/pojagewori.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/majujovasakuvug.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/jiripudopadobasi.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/55152687132.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/libojumikozubikupifuxuxes.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/57208619586.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/51840030800.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/27112720618.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/67173947611.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/97965040444.pdfIn PDF document text
    • http://landpas.pl/upload/file/58820304995.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/88053526550.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 17304 bytes
SHA-256: aea3a694601a8462164063f8035ec397b9853ff7c35bcd2aa05d013e2378d1bd
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 10832 bytes
SHA-256: abeeb18592902ac315a081f43284bb3aad5b77fa27937f7da729e4349a952431