Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8a79a15355fa12…

MALICIOUS

PDF

97.1 KB Created: 2021-07-24 06:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 108a27a16723605e7054acafe84fc86a SHA-1: 8358dc3dc515a5a29a85641183c344c365f7cd29 SHA-256: ac8a79a15355fa12bb9623312585864c4a667fd2a43017b79426725987493931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as part of a link farm hosted on potentially compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://parfumerieindex.nl/images/uploads/lovozijepurokozuxanuf.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0be39f994---jajipekaralepe.pdf
    • https://myphi.biz/nbloom/fckuploads/file/26845108308.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d9f25c07---59485907496.pdf
    • http://arch-teh.com/pic/userfile/76926960192.pdf
    • http://rayanchem.com/d/files/95385274580.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/68329132455.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b091123f9d---pomelabubejo.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b9e0182a---24394744137.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ae1d18c1---36305120844.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/misajopipuxuno.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfbbd80a45---28469240915.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084282de397c---83967700252.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/188n97j5jd8funmi5educ6l3b4/dipuxogurusefesobunek.pdf
    • https://webmenuplus.com/images/file/67906255303.pdf
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/10507652878.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/82120088b6ec0ec59ba6dc99ea30b11e/74825600076.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090da432a0cb---lebudipes.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca85d9c60---bavezogulerelifop.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9dfc71ab5---95374103152.pdf
    • http://robalton.es/Albums/images/file///minof.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/75741854368.pdf
    • http://viviapalermo.com/userfiles/files/47124034700.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ngt8s3lukoddugru71tsvhelt0/gasodawakonudoperuwa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=calculo+diferencial+e+integral+conamat+pdf+descargar+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fca.bin
d3e5ad9eb3dd64f7e03b282ebc4a364f8396b1488f0e7b6ea2eb09c7861c1138
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 19752 bytes
font_01_sfnt_off000142ea.bin
55154fe819068a7e89d5fcd40ce01878607670b29c3cb7fec9a32f9f3bd915e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x142EA 11092 bytes
font_02_sfnt_off00015c91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C91 16792 bytes