Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22a980e4db430fa…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 11:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 827312ac386e4e29da8b0bdf91121f45 SHA-1: 5ccd7b77e4aa0305a128e53a1b5b35f64147ed06 SHA-256: e22a980e4db430fa22da899720e4b44d8ab612700d348427fdedcfdba879b230
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. These links likely serve to distribute further malicious content, such as other PDF files, as suggested by the URL patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/bozogolafenusogituxafes.pdf In PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/tuliduboragifabimitutada.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/60183644308.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/88434024613.pdfIn PDF document text
    • https://festacontinua.it/public/file/79859103588.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/jibafuturus.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/fawusufujoxarizupizipef.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bolisoxegenovimolez.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/36162527747.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/fbd6d8747fd9b0bbd115b12d62ce1279/68867441040.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/34817134318.pdfIn PDF document text
    • http://mlight.cz/archiv/file/58590317266.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/kelodolatudowame.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13243719949.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/4347294973.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/vegokar.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/2616869835.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/gidogumodam.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/m0tc9eli499336umq3bquaur7q/fidaxokemamojip.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8i9cfeqrtvc5dt9765f8orcf1s/tuzekedefewa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86517b6150---tuzunesunomosowugepamuv.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/rajujos.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/disotabokipamuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=little+miss+sunshine+script+pdfPDF 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_off0000b94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 10660 bytes
SHA-256: a95c2faf17045ca41943456d4fe5af77dd066f8ea0fb66ba41e3ed77c49a85da
font_02_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 16552 bytes
SHA-256: a95d85964545bb98299f7c3f2cac6543a100580cb40d79f547c304fc083215dd

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