Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f1bc54bf1725d4…

MALICIOUS

PDF

80.6 KB Created: 2021-08-29 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef84a5f68a0b083752b6d95de36f05ab SHA-1: 0ea0acda5e7b1a5b4d06ef7f7af897a311d40f5b SHA-256: 79f1bc54bf1725d4a0c1c36097a5af0a2d4b9c2c44078f4f29cbddd9e3f890d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://mariellatriolo.it/public/file/nisoposonibiniwajedu.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609045b3efefc---16261229805.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/76824135324.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/xakifar.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/17155767547.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90584bdb1---65339766572.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/sinogaga.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/jativa.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6d995a9b---61480996681.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8d31f55f9781f49b1e2768704b752730/dapibujubipow.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e554d16a0a8305bcdd5b3799ce05aa4e/votug.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/desatulizexakaditut.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/26875046056.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/02afcd6a5491a8384e7fe4f598f90706/miminezujekuzuzawete.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/4322901946.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6ffdd0116---51375941813.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/31586712678.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95a8b9747---lebumiwaxoxezexupigefu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/vugefe.pdfIn PDF document text
    • http://sushi-belovo.ru/files/84400517180.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/66643000087.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/duvefotusi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dohdm3pvij8458mbjcubocs8ko/vewakitaz.pdfIn PDF document text
    • http://stevis.cz/files/file/81777865370.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/rewedo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c53f9c9ba---xudozikobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=winter+park+mountain+lodgePDF 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_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 18048 bytes
SHA-256: 2c0d66ec2fe0be57bafed304e380825fe691212e1d54d196a9bc8472072f8568
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 10752 bytes
SHA-256: 672b6f9aa878629c742c98a38e9beeeae057f58a34cf44c68fc84244c0f49568
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1