Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42b27d24d201178…

MALICIOUS

PDF

89.8 KB Created: 2021-08-11 18:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f75e7d9e8437db41e53d08ca488ddfe SHA-1: 0b38cb72c5692b4eb8f435c06d4cdfda187879f3 SHA-256: b42b27d24d2011782cf98a8381b6bc80138483c0322c47913f131a4a3926ab5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://drafthe.ru/uplcv?utm_term=clasificacion+de+los+compuestos+organicos+e+inorganicos+pdf PDF link annotation
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/442f6d370c1b902bf62dc2feebaadea8/gofipe.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/gejazikebekexufevoxitojam.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8980b9b43f0ddc8b9fc0ea98fca508fa/64104088532.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210810_03B517E72B501C40.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/00jin7lv43vhce3oo2nkp7e2tf/jixesaloligidudurasibof.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/56216412297.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/60261100156.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/mozubebuvinawukofumi.pdfIn PDF document text
    • http://slsnn.ru/content/file/sumawesobavake.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c042d36a866---98726567574.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/60174221533.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/15714157575.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/48842122902.pdfIn PDF document text
    • http://prestopc.it/upload/file/62948642295.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/muav6kb8tmprsjlrvu8fip6vkl/36789200505.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dqoqa1re58qoa6sa84fvoep97b/5476039132.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1f8e8d36---37232410980.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67697736412.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/74318822734.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/sixazubanukezasozusirose.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/xupipe.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/renikiju.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2b800d53549f11cd69d2004f97b7752e/35453139921.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160954e61dfade---ratopajalokobipazuvisuk.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 18728 bytes
SHA-256: 6d05b06258da096b4a2b1d306bfa8f53f6083841447f27bc1521cf9cd621713d
font_01_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 11092 bytes
SHA-256: 3d541b0ace2ab9c7b3397a4083c4a757d04dcebac254ba56a17cf5efdd3e942d
font_02_sfnt_off00013e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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