Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d69c6ef6726dd9…

MALICIOUS

PDF

89.6 KB Created: 2021-08-03 03:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9b8e85ef0d30c8e92afd09089cbb26e SHA-1: c4d75ed076ea2bc735c9a0466c77e83b8e65f2fb SHA-256: a2d69c6ef6726dd9deaccebaab1f8f6c7dbf36665ef5bb8845cb8aef8885722a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is a common tactic for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=the+modern+herbal+dispensatory+a+medicine-making+guide+review PDF link annotation
    • https://avenue102.com/uploads/file/73724163736.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f34caf6c1a4b085f34a1b66c593e4f1c/ketisodebiluv.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/68996006506.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/52611897419.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94c0be3db2---jizatu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ica2g7aojc3e6jdilbsea4qurn/82875948601.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/28258106755.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/saak4vt62qg3a2fihc13o80hu1/fezamovemijixazob.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/68068157402.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/33966534724.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/viguk.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/guxujijujewomo.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/duvupifegitasegimasenadav.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/h5ks82h7s0rmi77n79qg7p76v0/34165210895.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/78725933103.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dbb75bcd2---sarukupadefuvuf.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/moraz.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/88b2b4e049450a78c33fc3b8dcceb370/kovipabifigedifixev.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/25/file/20210525_232206_146.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/73261356811.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec37e291b---bemujebagoni.pdfIn PDF document text
    • https://atl-50.com/files/file/zineladamiwitanikig.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/73320645403.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/30365590939.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/58401166447.pdfIn PDF document text
    • 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_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 17132 bytes
SHA-256: 8aa8b2a04ed3c4a5d5940fe0a8ab5d19669107b86c70ad8fc41eb80ed97cca62
font_01_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C23 11556 bytes
SHA-256: 5b3394d48f3a4e4980d8f5de7e0f546f268fb9b9f3bece857c2f9a63f3164c76

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