Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4933bc9eb17975…

MALICIOUS

PDF

89.0 KB Created: 2021-09-01 07:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faf739084176670748d470f1d05795a9 SHA-1: 2c8332535c3e49f3caab4c54a5010f686ba094ed SHA-256: 7f4933bc9eb17975f269333468931fc29ba7215eb8624ee06963419d0b273a33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm hosted on compromised WordPress upload storage. The document body is heavily obfuscated, but the presence of a 'password-protected archive handoff' heuristic suggests the PDF is intended to trick users into downloading an encrypted payload. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b204ce6b6---16794803181.pdf In PDF document text
    • https://theshamrockpublecco.it/file/buxegadoburamugajowi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5658c399ab---99638296979.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/kedaxojebevajogedexivi.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/sipoxajokofitobivigat.pdfIn PDF document text
    • http://ailizia.com/userfiles/1508210344.pdfIn PDF document text
    • https://arendic.cl/files/jekuwiwufexijibakomaruxax.pdfIn PDF document text
    • https://majubesar.info/contents//files/webonuba.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/xamiwesirukoguwiz.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/72587235865.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/lonogununivipalotawibi.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/61277070224.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/sojobunirejinovalul.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077321750ebe---32957742235.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f6cac534---64051285964.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/rawugulidumepev.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/rufapiwifamejepejifuvug.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/wekuvagizorexut.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1f947e47a0dfc658c1911f3f61610d79/69809314567.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab016435bb---gabofixevewusuxofatid.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/fejogadofesatapemif.pdfIn PDF document text
    • http://contelex.it/userfiles/files/11643275850.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/jegiwamusibenapusat.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/5924994787.pdfIn PDF document text
    • https://cristalensi.com/public/File/pilililararigixog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=reference+letter+format+for+admissionPDF 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_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 17432 bytes
SHA-256: d23de69f2abaaf283a252931c7c1b29851e3d4e49eb0ded2007f3af0f9c0c41b
font_01_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD8 10684 bytes
SHA-256: a1d2ce9f93d6c9575904ab5f7e5461496a7d3aba6a57695bf18fad3cfbe59eb4

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