Malicious PDF — malware analysis report

Static analysis result for SHA-256 314b29442720d228…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 19:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a78400d92b6c162371085446bd8bb22 SHA-1: e52a8cb9a3ca8d618b1617d657c52d1d6080e8c2 SHA-256: 314b29442720d2286b04eabefd3dc4e74a588bcd87ca3727a0c98c7616d82ae2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm hosted on compromised WordPress upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded links likely serve to redirect users to malicious websites or phishing pages, masquerading as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d513dfbc3c9---numelelixufopijamulobas.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/56721598402.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160704ac764f3d---66145121764.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/92645651248.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9pculhk6ff4kortu87u1p0vsvk/42842603898.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/67397237366aac2e6634c6fe4eaf3a9e/34214969846.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/morowatezoxopape.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4a7ec19a4497370985db0932327957ef/99358380876.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4d6cff3e414047b6c199ce3b93991110/73947022121.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pil5cn6enb0ctbsif95qgap2e9/9338816480.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c8a4ae94cdf97c032aac8bf417ff1bca/15151320408.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929394e41a1---6637525174.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609144a342793---75850638308.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f99c145bdd---68425256236.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd6debc64---pawinotijuz.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/pakabujisemenowede.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/50619820522.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6ef28276---tozigu.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/gadukux.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7c8c51199ee1443e320dd8f7b1971b69/josupotedolazizak.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/43208887143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=toward+a+philosophy+of+historyPDF 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_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16804 bytes
SHA-256: 63b3c66fb7c5716052f749157aa62f6695bb74fbf0ab5d9f3ce85b54b6a3ed71
font_01_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2C 10524 bytes
SHA-256: 43ab21e3f03e7f9111b1e42fa303020dd022831280b079c07e2257e540eb6049

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