Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadaa1d9e2ce1393…

MALICIOUS

PDF

80.3 KB Created: 2021-07-15 10:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 331ba7c490160c51663333fabe624f12 SHA-1: bfb350bc14c6f89d067e4caebbded945afd92b7a SHA-256: dadaa1d9e2ce13933db78890334ff339377a429c0e56519c7c0987c764ec309b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ke70e9hjhkg7ohvgral0ba2s28/92267564405.pdf In PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d9c1ac296af381bfe4d69490e63b70d7/8124962368.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gisatexuzanevep.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qscc6bkfnmellgsrtqm7rf48aa/28725552813.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/61165689216.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5o0eedma2mkn7spvlm1fknqth7/sokelilukiwopusad.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/85681512222.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/kujanenujuti.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/92912280730.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082109eb8e29---xupomesaminimazo.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/6691104986.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd1f6c3eb---gitim.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24182c2e5---6561356975.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/64058105219.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/vijoputexameduxonupipas.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/lowoberotisolasofeda.pdfIn PDF document text
    • https://afayl.com/userfiles/file/45623281188.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/tiwejujovasujafetebedeme.pdfIn PDF document text
    • http://aa-nusd.jp/netezizefawovof.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/slnul9k2eual3ci805e4td0m8b/44293015986.pdfIn PDF document text
    • http://sro52.ru/uploads/files/debazivowes.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a6923ae96a411bbd7565f5afbe605768/mepifiwinowarasugovupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=state+component+reactPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10304 bytes
SHA-256: d5abde23d76da4eb022c16445f79b627a8c8b70ec92c7f029cccf5d78739ff8e
font_02_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 17592 bytes
SHA-256: fbc2607ca55c27fac3c8cca86a49e6195bb89ebed0f49d75ebbd2ee7b024d6e7

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