Malicious PDF — malware analysis report

Static analysis result for SHA-256 351f8fbb9dc6de76…

MALICIOUS

PDF

96.2 KB Created: 2021-07-28 14:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51ac1711ef50fdbc8e8a834b01fdd4d0 SHA-1: c4485eced28ed2fe0f0d815305fe4dfbbfb92c20 SHA-256: 351f8fbb9dc6de76201098d664098f749e7c1c9ff3878a529ab1603e55c88dc9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of these links indicates an attempt to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745f677c8ec---modazefibadatunu.pdf In PDF document text
    • https://anctools.com/ckfinder/userfiles/files/44941721320.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/41707798052.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/bogenek.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cbcc89488---likunuvotawoberozorapaxe.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/2348fc4239451417819c438866322c32/28991548150.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zokalisuredife.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8277658766205157908869ed58e0f55/pejevafesudij.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/45592153031.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/bokalenurisumotomalusiw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccecdb07415---87480104003.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/19375854278.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/leraramirogexavudo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf0b5990c---kalopidanedaber.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/74068511352.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968440b29e3---bepupejetofiretazeg.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210626074407.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kulokurejegikutiwawebemix.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/dazasivelojufo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160757a7f45ef2---gafifig.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/r77rg41qqub1akdd1ivt836d82/topol.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9413af5275333c591d2f3372020b7aa6/mubegotagukire.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/98hh6jn2ia1ntmp8g1sahcqpdv/23746867991.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/21183761454.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/beganakekep.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/85863434607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+adjust+philips+respironics+dreamstationPDF 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_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 17064 bytes
SHA-256: 6d897d352641a6286045b5e57a1ecc8d9b0f5112df838ce779aa45dccf277286
font_01_sfnt_off00014043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14043 11088 bytes
SHA-256: 7c42583b429cc48dcdd9ee79fddbd4981b512ab429fae1d6dfb4b4ba921a9e90
font_02_sfnt_off000159e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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