Malicious PDF — malware analysis report

Static analysis result for SHA-256 93272b3631075769…

MALICIOUS

PDF

73.5 KB Created: 2021-09-29 02:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7a68b0a33c3449f86db9f47dcb082df7 SHA-1: 68975030df3d1a1fae286195032b65bfeed14664 SHA-256: 93272b3631075769eb6038210ffdd0afdfa7089e77b03d57cb9665bb59236176
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The primary goal seems to be redirecting users through these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/winizerotiluluvuzosa.pdf In PDF document text
    • http://sbs-group.co/userfiles/files/6765806931.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/suzezewegupotenikim.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/24129630207.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pojerotutekipedo.pdfIn PDF document text
    • https://12shio4.com/contents/files/58802126396.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/54713575313.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/zoneselijigutabefekag.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/mavom.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/76572862806.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471228a787b---bodabobalololosab.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/38754487890.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/61915802327.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/kajomabe.pdfIn PDF document text
    • http://dobermanncz.eu/files/tedesukoxo.pdfIn PDF document text
    • https://togeltop.com/contents/files/dakebufoziki.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jubilipaxiw.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109122231258652.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e63c10c52a125d5dcb38a7ff89ffd21e/60224226726.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161416562e1325---21437911328.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ezoda.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/motezag.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc1e106ef---dixajiguwiluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=syncing+calendars+on+android+phonesPDF link annotation
    • 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_off0000b934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 10884 bytes
SHA-256: ae0b5b1940341765cf653faf6ddf63e71067f8240ccffafe802074adf3232e1d
font_02_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 17888 bytes
SHA-256: a7b91c5270bbf68ff2627ce4fb90e159675bc20cac5cf5c90b99652871397cfb