Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af3f775aaab2bca…

MALICIOUS

PDF

85.2 KB Created: 2021-07-02 08:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 529d8d58b6730247cb552cce18798dbf SHA-1: 9263e040463c9311b1d089280219721ac3089089 SHA-256: 2af3f775aaab2bca79186fb563b66f84b6c3121cb59d5314e4e2657a7f286cfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely intended to lure users to malicious sites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://medvor.ru/uplcv?utm_term=finding+area+of+shaded+region+worksheet PDF link annotation
    • http://diencohoanghuy.com/media/ftp/file/65020057059.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4k0naljbu92lh0p029ap4p52n4/zatotonolevuxulovibusadex.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/27c9n9594fjebhuspisn87in96/jokulek.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/94717153915.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0c4q7jb2npsopd5h4ful39heb5/61929452806.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f223a3f340---39312661126.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/65908813439.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/51686085086.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ab0a52a6b---foselatewijo.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/xutonekuvepawupabilatadim.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608566faf15e0---69263168214.pdfIn PDF document text
    • http://airsoft1.ro/files/file/magepuxidokudi.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/nunavuvego.pdfIn PDF document text
    • http://capital96.com/userfiles/file/bubagalemojepogo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a408e05e---83560238107.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/4627692583.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b7cea13b---23190537839.pdfIn PDF document text
    • http://vizcsap.hu/files/file/37534213224.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d22261341---nosivifizejubatad.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/93116605556.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2352ef110---lipumazufux.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607213137131a---zutilumasad.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098be9b7a6d0---vubebuwu.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/54712595763.pdfIn PDF document text
    • http://stylekd.ru/files/59933186580.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 10740 bytes
SHA-256: 603e7169952c83915ddb4af681b00d9367bb8363b45ada29cf942be065399819
font_01_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 17604 bytes
SHA-256: 8368cacd46f9e2e51a5c60b78a1d6a3e1041bbd79642dccd3e899977efdfb65f

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