Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ea1372049eab20…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 09:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 205a6ca8d86ecfcea14f7e9217ea9a7f SHA-1: 6a6a52b2c005b59f0a51ef3292a4139d58bdc1d4 SHA-256: 78ea1372049eab20bb4a881fd504c8e73f5ba14464e17d03aa7321cda1c5ab7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress installations or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jasz-pap.hu/UserFiles/file/85772544324.pdf In PDF document text
    • https://recapress.com/ckfinder/userfiles/files/37065166808.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c48cbe5cb---zizusakelu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160738cda4e6df---wapov.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160833f8f493b6---kufimazenigesiwof.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/88676390010.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160917a6b7eb28---14287957359.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/95799972542.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/38d5edce28a8747fdfa27956cf69b5af/97398622433.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/51154885587.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609109c7ad1b8---giwitatasixolov.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/viket.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/jakalosugoxoleruze.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/88550476628.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf25c689---73544213884.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d6d795c3cb1617bbfd3cb824c631681d/fekexevura.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/11937637012.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/fipeviriz.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/s04kuubqoljdtfrhr8cmfjhag2/paleragonaram.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/27840677220.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3gcodicp3osb61s9refbfkpnj6/43496555198.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/66113690738.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hvf5s560li8n28t9i3npfbkhr3/91041551872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=impregnated+in+tagalogPDF 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_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 17688 bytes
SHA-256: 6f2084ccef6b6fb782aedc40091fb5268fbf0c953eac97f5f561739afd797b90
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10516 bytes
SHA-256: 3a1b9b830317c300a7005082adc787d68b58e68bd291c9683e3b9e1fbd2502ed

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