Malicious PDF — malware analysis report

Static analysis result for SHA-256 773cfb6b791c5d30…

MALICIOUS

PDF

92.9 KB Created: 2021-07-08 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83e42dc48cb79d7963c718d5965d96a4 SHA-1: 0630eb74e5aa8237b817af971fc645993a9c578f SHA-256: 773cfb6b791c5d3099b5006d0cd953e02cc0d5dc2bc1ab804e965ff18942f6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a468be1bcc1---leganebiduxowuvabijorivox.pdf In PDF document text
    • http://sloplast.com/userfiles/files/pumanenaminupokowelotume.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/rolopuwumivujasewobuk.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/xolixovorirujer.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/79467691373.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8116092f3---46374449209.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c7e66d7f4---jotopawupapiva.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/wokamuzinoxubezimifugen.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f19c9c2f---3549887883.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/9363362713.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/79904061935.pdfIn PDF document text
    • http://funperm.ru/content/file/sipugegunazididuzux.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e273ac59e---tegojafakiluxetonave.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/mujewaluvusevedum.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/bowepagegaxakidaku.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8cc0e7ac6c0fddc55671fb5a1bf1ab8c/kudozogapukogejarelum.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/vagam.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2a46dfc11b833ee93f4c5895faa7339e/66194582043.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/70362273657.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///pukep.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kujedimirenopulibomaxadid.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/81042196836.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435687ac49---dudejexipimaxadavalaket.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/10858684970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=low+carb+chicken+marsalaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 10672 bytes
SHA-256: af614e8fa985fdff06749dee73c040e33f591c47e07767ef2c56406c82c6b157
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 17516 bytes
SHA-256: c1e3f1ef00c66702bf19990de2b0dd0d065f6fd5bc7589b6962bf78127a615ff
font_02_sfnt_off000135ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e
font_03_sfnt_off00014c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1