Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13e1b05ade5edab…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 15:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34cf9d781505418ae0122b6ac44ee1a2 SHA-1: efc9e459d9fdd3c0ebc8e5386ea432b579fd96de SHA-256: a13e1b05ade5edab9c375c886c94a58a1a8536c1496434d16341573706e6ea89
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to potentially harmful content. The presence of numerous external URIs, many hosted on potentially compromised or disposable domains, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c5877cc3---55884411726.pdf
    • http://stphilomenaonline.org/userfiles/file/luwojisojetifadaluvov.pdf
    • https://pet-fashion.ro/mm/file/82938502304.pdf
    • https://asiarsolutions.com/userfiles/file/dijivuxinuximorebino.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1fa18cac9---buguxifinowifegiterofo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r793ch1punoifaosdut4qo8e91/82416695739.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/98568598344.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecfa428eff---3782800271.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qq5a8tlkaviuc9mvc2fu44ut36/77001676823.pdf
    • http://adabaskimerkezi.com/upload/file/55979737379.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dll5qgb5f3g178s884nbprmok3/getelenab.pdf
    • https://pet-fashion.ro/mm/file/62138542488.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16070a308a41d1---fesefewozobitofolitesad.pdf
    • http://bjsprt.com/uploadfile/file///2021052113442747.pdf
    • http://ptairsupply.com/userfiles/file/31421392172.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8b7536b6795ec9f2a6398ccb81811a27/nijumevajewevopasozux.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608159fef201c---30836413209.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0cacf590bfcb9bb6b06f38a7a7bd7b4e/siwoxakododogedovafopofe.pdf
    • http://bindashnews.com/userfiles/file/8823543223.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d55f2ee02ad---82173351955.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/999b28f5b80739862a212ed9bc8c6ad8/kedosu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=muscle+twitching+meaning
    • 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_off0000e726.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 16792 bytes
font_01_sfnt_off0000ff3d.bin
d5f7bca90c7ff552afe11aac5672be093d66f261931cbd0000e71be638cb471b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10636 bytes
font_02_sfnt_off0001176e.bin
2f87f635d7cb8ad243bfb99b1bbdf0b70c9e02150d5f910b77e1b475364ed94d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 17896 bytes