Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed5eb23ab810490…

MALICIOUS

PDF

86.8 KB Created: 2021-07-22 16:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56934131931722e0e28c52dc9a9e79f4 SHA-1: 33974e5ca4f998773e3c5211686f177a8b36d7da SHA-256: 8ed5eb23ab8104901df61b9d91f3438d8d977eba03127535d96c26d533d44d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t1jmdvdkdkcs0ac0fbktvubpr5/zakil.pdf
    • https://xn--nmqu14inmf.com/upload/files/nirisidonuvewupalinokoxot.pdf
    • http://kirilmazbardak.com/userfiles/file/pataguz.pdf
    • http://imssp.by/data/images/fxeditor/file/8081540763.pdf
    • https://jagamimpi.org/contents//files/zipiviz.pdf
    • http://holzweiss.at/58950498119.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/0b22fe4d7bd05e30861e19da95f448a2/62999948631.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02598cd85---61894393239.pdf
    • http://centroolosprato.it/userfiles/files/76138966199.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/47606364754.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d6ffabdb547b3806b899a0f717661838/651745434.pdf
    • http://nicenpos.com/userData/board/file/2179750343.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160884115c4ce8---37201269097.pdf
    • https://topclassgardening.nl/images/file/jojituwevaxe.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc9261c1664e461f2d5d476078c3d891/xumejukiwasavonumerofaro.pdf
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/rorizawolojiz.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c82b43656---gegejugujavidejekafenef.pdf
    • http://retco.ge/ckfinder/userfiles/files/nivonulewo.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r10o132s67tv6eqdimhot5do52/52772349378.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/josidupanuvivazodetuxuzor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=middle+aged+male+stomach+bloating
    • 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_off0000edc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
font_01_sfnt_off000105d4.bin
8f78989c6ff36a1d872c6bf6572da8adca59caf7cba62f0b2f4ec92c1aced102
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 17872 bytes
font_02_sfnt_off0001345a.bin
e5824b9d302fae535848230f1d56e0bca4a1bb559ed64e5412efdae44454ff4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1345A 10848 bytes