Malicious PDF — malware analysis report

Static analysis result for SHA-256 8393ccaff0954413…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 16:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84ebf4c2267abd00d1b4fdc96021d4ca SHA-1: a2b7ea8e962629b3df5ae8f48f5f3ad9a7c4884e SHA-256: 8393ccaff0954413b95132d83ef896f6e3f380f8ebdd055e49993851eeab19ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=el+sedentarismo+causas+y+consecuencias+pdf PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/54867779208.pdfIn PDF document text
    • http://chapelguild.com/images/usr/1971458512.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/445645fac3e50e8ec09a68934db98c43/viwalexipo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4c34cc62f61b1dc8da0b5c0a58346fc9/gojesazijokedobe.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/beriga.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9b341e3f3e749ea34ed535c4872eb1ce/9710208916.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mududopivijaze.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/notunajinazigelalan.pdfIn PDF document text
    • http://strandedtattoo.net/file/wariponojavubor.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/23040372799.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d17d9e342---12686091411.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/20496982774.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/womejaluwenonalizijiwoxe.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/xufimurogorid.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3q1a4mun42jnaea1b3quid5nk1/wefer.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/kiwad.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/88984429222.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8d6a925e1---2981919629.pdfIn PDF document text
    • http://teplospectr.ru/images/files/raxapotewusutojife.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/vupigamagawurasuvebe.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/badirogijoxuwoz.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/vimepodebijidi.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/gokijatapep.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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 10976 bytes
SHA-256: df076094f740b25d53c0dab5ebccbbe86750cd6180c2971805c25ed54769486b
font_02_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 15384 bytes
SHA-256: 498c801a05226b55acd3277395e060070bdf1f8494a77e649db2dae44b5d71be