Malicious PDF — malware analysis report

Static analysis result for SHA-256 4579422d9c6578e4…

MALICIOUS

PDF

110.1 KB Created: 2021-06-29 09:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ca5ad310c8c49f3c6fbe32b63ba5bc9 SHA-1: 3bf67cd9cf0602c667686a7eb877358cc5b7ebd1 SHA-256: 4579422d9c6578e412035f71660d98f391a4905a702c2006254998af883995a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=narcissistic+sociopath+meaning PDF link annotation
    • https://svetplus.com/userfiles/files/79955498821.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a05074d---28996034194.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/igrk3s4np6jj0h2thfsk0u7uc1/fajivefiko.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/dilipafamafujokotiz.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f5b0cf98e---20683444889.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/nupotumufo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/026996260ab1023e4b4b633fd874ede7/juzavovipatuvasumixaki.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/95828955003.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0b2bc2c7a1ee6820594b524558a0aa03/ramujuguvinerasalamifov.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91a60065c---buliwovopim.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/51148087034.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4cacb21eef7e778668eca2406aa3d7df/82007827077.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5115c57e10cda8e085271e344aaf77bd/gofasizivowomupodagijaj.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f939817fd---63733697123.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/xogovigavefejam.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/adeu98pkiu6ligrronq20tfua3/ludup.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d53e7c754f2cd87defd29e1c72f46c55/ninulolalel.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/38415259293.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/36846755582.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/32373378132.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/18134663044.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/padabewisat.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_off00014f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16759 10752 bytes
SHA-256: c50219d49258eef088e5213b6f71f81a9d3a6c287f0bac1366814a92bac8863e
font_02_sfnt_off00017fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FEF 16792 bytes
SHA-256: 9ec57dbcbdae7ff1794b4ce5c14d3caaa323511556d382cded716ab587d45820