Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c08f69edcf5d14…

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 14:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 815db47021633cf09becc4a492412322 SHA-1: 2515e18762fad2d5f1efc0c3a7e5abfebdaef55e SHA-256: 26c08f69edcf5d14804f4a6712d100492062f71bfac5b44dc4180f9a260d1a83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=how+to+put+out+campfire+in+minecraft
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf25438ef1---60684229943.pdf
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/migafadapadadukanumuneke.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ca49ef54ctckce5ujjknaedv2r/9813492522.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506041706.pdf
    • https://globalmediaminds.com/uploads/files/zetumikerivudafaliloxit.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b5ab7c4df524ea3d58faad61293b1845/51909775273.pdf
    • http://championsview.net/userimages/10016724633.pdf
    • http://kayapaliinsaat.net/file/mifikufofepuzufovivipo.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/04o4jlah6en07vcrvdnif36sie/37164648305.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b906d3cc3c4---gefogesumirodagofoza.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/96a2602ff083a3d003b26f191a736a03/nazapapolozanipobi.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/tuvitibetitigatavone.pdf
    • https://suma.ca/upload/editor/file/74833521155.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a371d0622bf---nafisukegavozemuzoron.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/058fde73ecdbee2fd2485392fc7c9a5b/91991593835.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/16b5f4f2f9d999aea7a6993b9945a182/10849014558.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db6799ce53---tazuporebutomidoripuwuraj.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc6233fdb---murefujativabiwuwev.pdf
    • http://tnslib.net/userfiles/files/rewimesogatotipizifu.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/be002925a9aadece427e11c59fd386fd/bapavepedumunibaxaxetejen.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16cc586a9---36066467655.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ct63no26grpk1j70plgqmndj97/wurukopif.pdf
    • 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_off0000fdd3.bin
571d629e048e35be45e721698cc13303a70be5f583be1fed49287a23ac87df18
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 10604 bytes
font_01_sfnt_off0001160e.bin
456546f6c78c29a309a86cef771a3fc13ae3d0bc5a61f6ff2d7d5c7b0d3e4f74
pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 17204 bytes
font_02_sfnt_off000142c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142C1 16792 bytes