Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c78018aeadf0ba5…

MALICIOUS

PDF

133.8 KB Created: 2021-06-25 23:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 254d0128e1a6a723545d97d01648741a SHA-1: 4dd80db7155ceafd62f6631db22fd7dd5ad4491d SHA-256: 5c78018aeadf0ba5ed46f4ac6d83737bbc613ea150401b2dbc5b69d682d4feb3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The document body was unreadable, but the heuristic findings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=illinois+class+c+license+test+answers PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1c0be6c6fc3a5b9c4b453ff6891059fc/79516794806.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841860b2bd2---59080649509.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8bf79426d0knmjmqao1gasngqr/26139339133.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/22764627785.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4243b072721ea6f207fb81cc635add61/xisopifufusiretosogurobax.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/gasirug.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c1d66e23e3505eddf0f78719fb674ce3/xigudadideduvumewanopiw.pdfIn PDF document text
    • http://blueyee.com/upload/file/222334382385.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c650d88a2a---monusujixav.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971deed91ea---nexabifinufijemuxas.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/gebupakimibatik.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cdmalimohbmd23t4k62btnqqs6/rinetegetakotu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0593c750c---60740661602.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1de24a7d06---bixanodanazejevimilazix.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/51d9755a6b4b2acf8d6c69cbe03ea7e0/37464287028.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d395acd4---65405781584.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/76745628907.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/78368812889.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/46088917947.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/96876997233.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d84e29b0c---xapup.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ddhj50lffnu4g1nflkgsatpfnk/26311486296.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c383455f9d3---61996733591.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_off0001a900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A900 18612 bytes
SHA-256: 2c7f246311a79677dcb7e8d773263bf437ef45588fdeac5c997347afb7ad317d
font_01_sfnt_off0001da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA4A 10260 bytes
SHA-256: 05229717ea300e334b48ca71d63cd88919e47af70598400cc9cfccd2e188e8f6
font_02_sfnt_off0001f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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