Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1c7547a2b1cc7c…

MALICIOUS

PDF

123.5 KB Created: 2021-07-02 11:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f4e9be982a7edf82f9e67f5887fd9eb SHA-1: e0ca72b3b191039f184b2fafd636d560ec8bd73b SHA-256: ab1c7547a2b1cc7c6fcdc18f60548d36622a52864300f89a543676717f3896ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggest the document is designed to leverage compromised infrastructure for hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44749f41b---12855404518.pdf In PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/1b3640e0da1da777d829e7686c4ef5c0/nuvakevafoxujawujodagana.pdfIn PDF document text
    • http://envigest.cz/upload/file/jevodikavi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609888497e33f---1376532711.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5kq4eus4t39lkgt6ql97lnfj1u/30456568816.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca9ded12c---nabopog.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9220f69b2579a3a5739cc13b34f0b053/45310829737.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9402ec87a40dd96d885da5688c47faab/23223124594.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160763301115a9---21818161519.pdfIn PDF document text
    • https://stopserv.ru/files/file/4882547520.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/58c08fee79737082dc584309133fe6a7/27630679523.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/rbdflqiosblc4fhg5gla2rspdk/zubakal.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/38bbe5545d87077edb70ac5dd3da67a4/sojak.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/bapawexavomufaluvisitev.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee1287b7a---83721070831.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7e919d84---6924502460.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/lepufugekedivukugukubupa.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/kdkieh5pl2827mqtvj83asijio/vijutilizage.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb005929b2---mudujabofewegavujol.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c8344d527---zufiriradezomubebux.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/64809674707.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/reravonufazasopokagefojal.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/wasafo.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/82584112253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=baby+sit+on+ownPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000182c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C1 10216 bytes
SHA-256: f4c069055f7e64f94449ee399e384def7f3b88554c62b838f71df4798622a901
font_02_sfnt_off000199f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199F0 18256 bytes
SHA-256: b684c76be7672678df4ab5b05111f94c02330479c92d29cd7e1e81ee78b21d2d
font_03_sfnt_off0001c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9AF 16448 bytes
SHA-256: 50f62320d9a238b94932d99dc94f729b99b3b635c4b298a80d0e8038a340c270

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