Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e9f5df43d34d34…

MALICIOUS

PDF

88.6 KB Created: 2021-07-07 23:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb0893c540896c2644a37dbda2d4916e SHA-1: 5357b3b7cc22fead7dc4f54e5049f29fdaf9af09 SHA-256: e6e9f5df43d34d34857b166ca0d4b4c6ad822fbcb491ad89a27828ecdd93b12d
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. Crucially, a heuristic indicates the document attempts to trick the user into executing commands by instructing them to copy and paste content into a shell, a common technique for downloading and executing secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u9r8v804e7fnmg6ttf66cprgn0/50103729264.pdf
    • http://vstarmp.cn/upload/files/20210708_011851.pdf
    • http://samafb.org/uploadfilefiles/rixekivuximi.pdf
    • http://agcslohian.com/userfiles/file/pilubapeworasexumewe.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f952c188---difoxunekizofalabononono.pdf
    • https://transport-vehicules.fr/userfiles/file/sararanopubukopelokip.pdf
    • https://5a.ro/ckfinder/userfiles/files/14455185288.pdf
    • https://linoforti.it/file/22125877814.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e947193326---81432888965.pdf
    • https://easy2ticket.com/upload/files/84467398153.pdf
    • http://www.asslar.de/downloads/31207683328.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3581737a---dedabisevugagozokezape.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/120dd8571be842d353842a891d96dd69/88008903667.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0163bd873985ff5753b42c8b00d95100/jefaxajugonewiwatuni.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3df245db3---18988474949.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4599c2f4c7---64967731845.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3651821ba49dcbd66c665aeeec22bfb4/lilipifupawovafabukenux.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c57a373f3---82506366293.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/387fb1ccf1464d93609bde827f7894db/vadafexatokewebegubuzukip.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/88037562473.pdf
    • http://turnyras.lt/Files/file/90833295912.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07d44bac1---nogewoxagijapineza.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/pufuk.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/77f5bbad137e85843ef040b15bf13b16/17652760357.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=football+giving+him+the+business
    • 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_off0000f568.bin
2f824b272929cf1be000d121fe1c1658d5e5eb936c603cf09354951d954ba3ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 18028 bytes
font_01_sfnt_off00012480.bin
11569dc4233eac653ee06f50d202288f55ca0ff8c7f1cf2f6f2cfe512177e6a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 10736 bytes
font_02_sfnt_off00013d09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D09 16792 bytes