Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a2b07e0e3fcdea…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 06:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 737792496e5bd3a71f5e93d265013f74 SHA-1: 774e2b672e353b150aac4d02df5272d66614b64c SHA-256: 54a2b07e0e3fcdea6d3dc7542837e8c51f01f97a259e21bf2efac2a0ad7fa8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics fired, including PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM, suggesting the PDF acts as a link farm pointing to compromised websites. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://pixomot.ru/uplcv?utm_term=ssb+tractor+parts+and+manuals PDF link annotation
    • https://hosvagyok.hu/userfiles/file/gurul.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55322f6d9---lipufevanusedamepojavu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160930eab4d454---27884833656.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/gusiridopugi.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/jamanasekobar.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/65786648001.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/muzezilutek.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/86549694903.pdfIn PDF document text
    • https://asiabiru.com/contents//files/fipomidulano.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/widofabitibokojiwifopoti.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2874467b10---40902005727.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/goxuretamofupixe.pdfIn PDF document text
    • http://groupkaishan.com/d/files/fevose.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822c78baec1---nozon.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ra4qu4dq2vfopfjpisleqrhrd6/wogobegarilolonom.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/nepatozapubemofidap.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/7ki65b0g0vcc33v6vrb319k638/fexetekepol.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa18e03a7---duwoxipes.pdfIn PDF document text
    • http://cabini.it/userfiles/files/bawurijewovupujemufojaz.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082597301cb5---31655981410.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rsvpkro4fkblgdh0lskfibrjh4/jisobiforerugukikitikiver.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_off0000ba3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3E 10768 bytes
SHA-256: 0e292f781e8ea656c06f2356949d8dd8eaa1e4b26628d3dd94f98b27ed85cc97
font_01_sfnt_off0000d2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C6 16248 bytes
SHA-256: f2c18b6ca87d61016320cb74dcb89bb94c86928ba7a8a1cf28863771bd6c1421
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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