Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cef7d48f84bf24…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 22:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c39216a9777b9386562c76e5d23935b9 SHA-1: 0761434463a2c72a1e6c69aec0ff3af8ebea7c00 SHA-256: 79cef7d48f84bf24cdf1a5d7c6a01d54f1aae48ea40230cc266ee906bdf6a807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of these links and the overall structure strongly suggest an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=flow+of+csf+through+ventricles PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mo3210pomkk0jhhev3c36h3lq0/wesen.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/3aed71cdabc895894b920ec854f51762/gubode.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf856f144---fefitomijorujowo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c56b795c62e---45068403004.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf184432a8---8687382807.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/48789244307.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2897936ca450c9e29cb08df3bf60ec4e/ridufefewadilato.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/76336912037.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/suvase.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/311c31bdb9aa9d7e1e66b43d788caca9/fidutuxibonepufel.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bc8c210b---55637377437.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02f5892bd---rogaburobeta.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/tobapotivikukaxuw.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/66834146316.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rowatemer.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097efc598933---99785639732.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921c7378223---39428097519.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/binomewa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c7671e05ec1f11759b212b08724cae3a/tilupadijubirasadogenu.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/55172979380.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/komovukonomiwutiwufako.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd7297087---zifawapapabemaketufaxi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160808ca133b26---nudap.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/46219985549.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_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 10684 bytes
SHA-256: d78b60bed2a5ced92ca390f2400a9fb2f44aaea3dbba179c1edabfa0f18f2a41
font_01_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 18000 bytes
SHA-256: 8515975a09ffb914aee779b5ef9f6981a2a89cf1838fcc4ea0c22b76aa39c047
font_02_sfnt_off000142c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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