Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f5de5303a42111…

MALICIOUS

PDF

83.5 KB Created: 2021-08-28 15:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ced65ca4e7b8a03f0a6775d05f4f26fd SHA-1: 16665c25f410d8248c56456e31cb78de238aecc2 SHA-256: 90f5de5303a42111e870fda06ed55d43324d52fb1fb43f306e7b95c09cae2bb5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on potentially compromised sites indicates a broad distribution effort.

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077fef4e6013---sitibexenuxafesaxasimede.pdf In PDF document text
    • https://divetechmarine.com/contents/files/faxudokijixubi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/02f4301e32895258978385b3b68988b1/89554090505.pdfIn PDF document text
    • http://bptramptour.pl/files/file/duwegelalewor.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/mijesuxenoxufu.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/37902580962.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/1592942442.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/4859041052.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/s2so6f0dmkguv7g9occ9e3hv1k/58376678134.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8d7576735ba2f52be42859a22a48a34a/miwipasutupivorujalizur.pdfIn PDF document text
    • http://futboltotal.net/images/files/tepidukozazaleruxebon.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108260346322362.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/8109558572.pdfIn PDF document text
    • https://aaaxxion.info/images/file/tovuvezewo.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/boraxova.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e5513a1a---vitegejogifisonetebafofuw.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a49f02d1f---1962257373.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740277e9c6a---vitigavi.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/45309376697.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd447dd17---82746877768.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/96077853286.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/75646439143.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7160e4494681b51f6d64d4a8cbf41f2a/dizuzeteb.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/4798992009.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079992b734c6---lidixupumisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=i+miss+you+rest+in+peace+quotesPDF 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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 10800 bytes
SHA-256: 2185bf7824f5f64b93bd0d55073a1a676a30d78d2af01783c4802536f9ba8d42
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 16268 bytes
SHA-256: b98a30d9740b58aed7ffb41c6f8788a6109f46300b3f4f5f971c492ec81a7e71
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1