Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec0d1f4ba3e2a12…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 22:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 582be1d1b58088be2ccd81d8f19db50c SHA-1: 583bc8937cdf998aee2c481dbac08c363b897b9c SHA-256: 8ec0d1f4ba3e2a12d34d2fe7c00746e85e1240048157034b99739dd08c793cba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were directly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or trojan delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laduses.nl/image/file/dudotodisajusemetifatemab.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/zafovafi.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/82727451912.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/aea3f4ad3678a2732cc7785d905c8e9a/12786249744.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608353325f8b5---jasezajuvitufufod.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-15/20210515211735407620.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4b9bb79697416f6cb636cb41d658345f/jagik.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/85614467775.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/6745005529.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf708985a1---wotalizixinoti.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/repimuzeruzarusaxepa1622780426.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/fee9f2cfd25f5babdd5daa2f9e2dbcba/sigovimed.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/tifojugut.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f088a845e---950131752.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/14432279886.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4c085881---82839238419.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/jewerifivi.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/21d990de25f0afedc12e62b65351a0ef/naxalutujevelatelonu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4c7361a313dc2e72eace8ed0e57fafe3/tonirejugigomagase.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/85673055901.pdfIn PDF document text
    • http://grotech.in/userfiles/file/xubarubabopewegivog.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/tugoxa.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/15944096009.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/967f49188c93cad9bb09bdb989e7ea99/nefag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=book+of+life+full+movie+onlinePDF 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_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10156 bytes
SHA-256: ffbaf9d0b9e66038143eed28ac42ba3232e8c1707b07c08d62d3b104869d04d2
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 17848 bytes
SHA-256: 79aad34e15f9895832718087b733b899e9cd1eb29534327dc88489bae70ee500

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