Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f87c4769fad3b07…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 05:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1769c33273722d6842cc92a9678cd5d SHA-1: 1d3af509e78693ce8ce608efee1ddb014669aa27 SHA-256: 1f87c4769fad3b0724cf8dc99206cdce1e25a75cc234d5cf8231f43ea9ce1fba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://jl-vacuum.com/upload/files/rixuzunewesavuni.pdf
    • https://anfauglir.com/images/file/58806175152.pdf
    • https://chornakorn-packing.com/ckfinder/userfiles/files/pisusulikemipaxuwesap.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0769c6b27---42355396231.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ou9uul5spdo9v4scso6d55rfvk/78647126471.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/13161601602f1bf3b3c04e7611d44369/vediluxurepinomarowe.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/krr28olm1viud3rd7r7n5lcfe4/93954705300.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a431ac319a2---74441024150.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e4a753f8---34432996834.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a70a6b2d2481943a8a7ae7397b152f59/15241630536.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/novepilax.pdf
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/lunigapu.pdf
    • http://thesecurityguardunion.ca/userfiles/files/64456726404.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vijc30m6p1k7d0lv0tcaqp3rob/72219432678.pdf
    • https://bayihoki99.com/contents//files/fevurazesabopoxe.pdf
    • http://clear-es.net/yamituki-n/uploads/files/5911383473.pdf
    • http://congtyvima.com/images/Download/veropokazuna.pdf
    • http://daydreamspin.com/userfiles/file/66853915612.pdf
    • http://bud-drog.pl/userfiles/file/nisopudabexutagovisasil.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/72779843338.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d6daae311---nogifipowujajowupi.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/656e5e7ec641af9281458f0f124c47a9/1081097426.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2c649f332f5d26ceac3b786a34a0bffa/2572022611.pdf
    • https://zivotzaokny.eu/res/file/xabilobilopimopikax.pdf
    • http://hflbdq.com/uploads/file/300050045278.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/nofimozegefamowavo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chevrolet+optra+2007+manual
    • 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_off0000c109.bin
9defb11da27ebb485052acad0bc6740cc66dad278ad18984d8466a7b17a2b438
pdf-font-stream PDF embedded font (sfnt) at offset 0xC109 17804 bytes
font_01_sfnt_off0000ef02.bin
39fd6aeb0d9eef88d4b9b909a5e23b910ee66975becf33440aa2875ec6527524
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 10748 bytes
font_02_sfnt_off000107b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 16792 bytes