Malicious PDF — malware analysis report

Static analysis result for SHA-256 70373fb229bfc51f…

MALICIOUS

PDF

88.5 KB Created: 2021-07-27 18:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b1e5f9ab2cd6cebae1a8657ee3ae43b SHA-1: 820383bc06f25b652998ec94dc482c690ccdaf66 SHA-256: 70373fb229bfc51fb697858ec78c81fec1140b95216f68f6351163de14e090d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute further malicious content. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36c826b4b---sigexerugorop.pdf
    • https://buka.ru/sadm_files/23938765578.pdf
    • http://asea-admin.com/_userfiles/file/20210507174913.pdf
    • http://ranaghatpchsschool.org/userfiles/file/1997009049.pdf
    • http://reelproductionshd.com/userfiles/file/22270461718.pdf
    • http://dongkoo.com/uploads/editor/files/birovisovuge.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/36392279328.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cbc6e3a211b18d99f7993c022084451f/31200811499.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8cd7cf48f406a6f6cadac09df29132da/talumabezesuvazip.pdf
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/24025473069.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/55209963966.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1e351f0add14031e75cf12e4ac881d2a/nexonexofizefoma.pdf
    • http://bocghedanang.com/media/ftp/file/86159628236.pdf
    • https://aradovan.com/userfiles/file/lanofi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092105b6de4b---78099123917.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608321778ba4f---sodomavoduwaxilolizimuv.pdf
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/71811558182.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9e6cd0b8313d232a5c0bbfabb1211abe/61959573907.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iuadmmuq05u8dh2o3krjacf7g7/37194607045.pdf
    • https://parfumzone.ro/files/file/lunixunakekegakori.pdf
    • https://ikansambel.com/contents//files/12836908950.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f010a71c9b99284da707b9b68d4cea33/78630090854.pdf
    • https://benqmusicworkshop.com/fupload/file/28742222075.pdf
    • https://astefin.ro/ckfinder/userfiles/files/tunikatuzakoni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=complete+calisthenics+the+ultimate+guide+to+bodyweight+exercise+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16792 bytes
font_01_sfnt_off0001095c.bin
daa799173105f6482423a5f52a7b1b632dbd1827d35fc3c42db6b03ad7f7eef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 11640 bytes
font_02_sfnt_off0001247f.bin
489857c7391e9907333b1befe267f200a33a6aaeb2a264a51fdea65edcd3bfde
pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 17708 bytes