Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c463438893327b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 23:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8578cb440556115c77cee39add2c7ecf SHA-1: 2f094b4adb69e121bf556cb9f1dc27944e0869b6 SHA-256: 85c463438893327bcfcbbe9f577f692d772867b14a29ad21b0e05d2f82a93ac5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics indicates a likely attempt to exploit users through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://akkoryazilim.com/userfiles/file/21650108200.pdf In PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/70985869791.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/31921914380.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/33674013461.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/60779769441.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0286b3be---wovipibareb.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6933997ebe---rigozabazibuwedosubib.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/67355670837.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fvfop7a7gt76dmos80k2jace0o/xubopilawifubipapapu.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/65e9e7444e74c33709a37ace1595f61d/36463210666.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8396bc4da---65756326722.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b863b42b---44365107520.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/59176198708.pdfIn PDF document text
    • http://allycatering.com/userfiles/subupoxeguvopilusokokovas.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/5a9bd96bf306bf86a6b05389615fb853/29082340028.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/menorug.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/rvjbkqi7s3n8e8jkefvp0h2ts7/99766862433.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f95dc998fd51b831a5ce7ff3a8e5b45e/35275085786.pdfIn PDF document text
    • http://siembra.me/uploads/files/46378507438.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/xizowuvowilab.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2249d85bb3545f2c43f2fa15cd3693ae/86726997401.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/fexilodajexamexidejo.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/86760338964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=severe+lactic+acidosis+icd+10PDF 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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 10576 bytes
SHA-256: d2fbc9e3e891937541344732711a16d144e065f266113a3e1d6f6bcde3f05a49
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 17956 bytes
SHA-256: d8d7c4139f9cd374d7d1313defc3558dfb39c163d11f402e097825cd0dbce392

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