Malicious PDF — malware analysis report

Static analysis result for SHA-256 df270a2b508d0072…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 14:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43c6d88ce0f3637c659eda417a25fbb0 SHA-1: 7635a61c73ec1e00c267af3ecf20f698b5d8d44a SHA-256: df270a2b508d0072a867d4d7abba282ccc047f193923dc385b039b4760602b28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=play+store+app+link+download PDF link annotation
    • http://lechioutdoor.com/userfiles/file/sejakoje.pdfIn PDF document text
    • https://t2sc.me/userfiles/66476203747.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/16761408326.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325d65212f1---firotolazedopofunejupe.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/gelexomobegobisagesuko.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/efc6f502cd5b3c3ddf68dd906244471c/83251348580.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/rerupinojemuzog.pdfIn PDF document text
    • http://baove24h.info/upload/files/zimixedod.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/pedipezezejozal.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2c4f9f52b---36808980795.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/68204439502.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/soxatogolunat.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/16931501213.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuzumenilunov.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/numobidusatarixisu.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/tewowe.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/bofulolitofusi.pdfIn PDF document text
    • http://prograsifkalip.com/files/xexowojawi.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/96849695767.pdfIn PDF document text
    • http://szcftz.com/upload/xinufedotixozinazedinazit.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/58104944670.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/89839516106.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_off0000b0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 10676 bytes
SHA-256: 3d02a3cd996a5f7eafcdc50f0e836875e3b1c7e1059aa0d9915036e292798efa
font_02_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 15724 bytes
SHA-256: 5eccac921d8288a92879a824c89198fcea056628247be0e735d694550cfb9043