Malicious PDF — malware analysis report

Static analysis result for SHA-256 98684d9029531bcd…

MALICIOUS

PDF

194.3 KB Created: 2021-07-30 06:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5639cd99f3bfd5b71ea25843dabae86b SHA-1: ac14c84941bee59d2739576216babedb5e8c6c98 SHA-256: 98684d9029531bcde6c8d79efe3849bf5e8a134c9e586d99ae4d043815ce202b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised hosting sites that serve PDF files, likely as a lure for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading further malicious content, aligning with a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9458

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ahkjt.com/upfile/file/dojisolu.pdf In PDF document text
    • https://dietacud.eu/upload/file/28198266024.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/43941549354.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ln43faflraofd5fqvsa9n8s4m6/52836912582.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/3622c660904b21f0100f4377ec1e8a72/nekajejuvite.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e108fc5b---xepozekudanifufodiwowud.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/601ae1fbcf61a14b7bb77c644135e967/busudof.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/52b1f66819388502a7ed8b0af27eca7e/73197279563.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c571a8edf---10217299137.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3fd5e3d3---jematirazutulolisini.pdfIn PDF document text
    • http://medi-sen.com/files/files/44628730995.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/31470f2cec5f79d080da21b0fa5de7bc/36246458983.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/xuniwegejitaramasek.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/01de97c6f57e474bf4fc7d0ebb0f863a/vupazut.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/8d92f9.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/zumadufikofefilisogipugi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/mimib.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/15309945823.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/75554675501.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/vokezefodokovijadokodev.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/171317615.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/dozotenadilojiraxixokizu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e596f1610a00a493e83d195c331f3597/kawivasunejuvate.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7aca373692b05286698a1852fef0f0fb/2396983369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2014+vw+jetta+owners+manual+pdfPDF 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_off0002949c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2949C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002acb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACB3 11224 bytes
SHA-256: a265c9512753f96b2256d3c8325637202adfb9c3a07edd919846e759508f5d35
font_02_sfnt_off0002c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C730 18956 bytes
SHA-256: a2e4378cf21b70e96ee7e9aeb9de2fda23385569f19a2d51123f58bd209bbbd3

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