Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd6c9b84381a055…

MALICIOUS

PDF

86.2 KB Created: 2021-07-18 19:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b345d234b65753f49e525f646897e03 SHA-1: 52b9bc632397fc7fe6556c74e6ad4ab347988900 SHA-256: 2cd6c9b84381a055642ca7f9158bc36efe5fb428a3923220d690c2cde3208fb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://curry-box-deluxe.de/userfiles/file/revetevud.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/a80o239dmjposi1tr0amf4qia3/lepojoturuzuduwuxufonibu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zidotidemogitokofez.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/89102720374.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/soxigepeged.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4043c36c90cd4f0cfe2f8aca06def525/mokomojeli.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070337922b36---79497930561.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0093c78bf5---nojuxudu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5d50f95ac9a6521979c47c68273bf27d/27946063606.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/16b672e06677636061063e2520ff8dfd/52747089642.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/42246599734.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edef13ebac7---94688813186.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/34a7e3e0993f9e45a83b6bb76d92b8aa/22732399407.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106040936189542.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d0b98734---81044475291.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/29148161700.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cf8e5fbf1bfa95261773964ad79c4eff/wusetuwawusixivu.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/fijujojexez.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/fuguwib.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0ab00230669db001fa46960be4eaae16/74338325827.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8nu7tlqlmbij9gkpb1u06v6v6a/wadunubixu.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/bazot.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0dee8920a---28635451591.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9a5cf79b---rimanevamexavuzitut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+theory+of+attraction+pdfPDF 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_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 17236 bytes
SHA-256: 497a8eb7e396acb34bb4e207e2f10d03a7171ca802b0766f8e8883dfe5e2e233
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A4 10580 bytes
SHA-256: 1beb10f5f15257594ee6b4ef461ece5f826c392b343ab5daf6df65c8c28eb22e

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