Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c56da7a56841831…

MALICIOUS

PDF

80.7 KB Created: 2021-08-31 23:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28aac61571344e847129efe5fd5ba029 SHA-1: 4deb09be63e6902d3cb5a3dd99d9e4886976f49d SHA-256: 2c56da7a568418310c2a9fcd65e3cf1abe7db559b188b03d919462e1b57ceb72
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://medvor.ru/uplcv?utm_term=with+whom+sentence PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120bf4543bf8---kexepaxabimavaxaxu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/elbsb26j8rqcqla25hauv22p7h/vezavemanis.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ea0f1b1659473ee885b09084b8d5448a/feworixoti.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c3d4474e---dipedik.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9ltfdvacuqrohhqm75mjd6l518/ridepojatokagebovu.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/jukoxokox.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/xujomopeveselarodew.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a084fa67737---kixuvafagurasudofevikopu.pdfIn PDF document text
    • https://telenovella-bg.com/files/zidakosirijobafewij.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8c355961---36109703384.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/jogimutozexuvomupajibiz.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/gukaxetalometabulapa.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/famugazewovarazimu.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/nofineruzu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/61210065025.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/70595810487.pdfIn PDF document text
    • http://tai-group.com/upload/files/dedoworu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/komasedabob.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/49747998955.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/11905701734.pdfIn PDF document text
    • https://bnovum.hu/downloads/77474873042.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 10264 bytes
SHA-256: 6e757187305f7b0d34bcc57358c72165b92217a77b592e713f46ff2e529066ef
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 17084 bytes
SHA-256: 1a3df581213c73f2e1a688e7d16297a9e395c33a06c737d2e75852de077d0b9c
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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