Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddd45acfd8a4edc…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 22:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c685eb6742baa497f3b603661eb6ba80 SHA-1: 5898e379b52fc49018ed5b6b2c32940dc1fe0719 SHA-256: cddd45acfd8a4edcae02ffc514bea28da2565c0aa1ea248578e7bdbeae38997d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://garglob.ru/uplcv?utm_term=mcq+on+soil+microbiology PDF link annotation
    • https://ketdoanbus.com/webroot/img/files/temunizuki.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c97004181---38962240052.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8466d5600a---35405134182.pdfIn PDF document text
    • http://babamoleskine.com/files/file/85642921940.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/379679220e102694509a5a7fff6ef62b/wokatekagalile.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a8552b3a805e6e467fb5faa831aa7e3a/bukasobas.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nbporo8b2fkhs2dlp501vkd9q0/fidoneribujab.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/77739093733.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/73596547478.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/rsa6ocbn41voh3csj3mpskggct/77999549842.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160708d289f922---99175187782.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15c38f9ca---60044667149.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b76995c6d7b---fazet.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45cedb1c1f---60680666297.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/o81hddggeq2jv9nobj165eo537/kofamesijulinegepuk.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/43414159316.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb7fc47d17---gakanujevodokuvi.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/fivalikizef.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/28116800529.pdfIn PDF document text
    • http://fxmeat.com/upload/file/6e77e902fd5561653873c9a7bfacd270.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/30007af38784ad8509cf201b99c95eee/zejigisalowesoma.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7daf0661dd---86607165863.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/i6na3oe8lhh6537mgl8lo6ern1/41450958549.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097542c4c914---57822277005.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/g9gme4i1hi5l14j0p0dunnvap7/81658830942.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/2403023211.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/gavuvegaxapenulaviputa.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_off0000f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10572 bytes
SHA-256: 1fc9d0f5994b674534fe95dd729eb8eb9da553b85d488415286ae13394457e6a
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 17948 bytes
SHA-256: 72cc638af8f2a0da32c5452f77f0c8458377b1ebf60db633494bed8a8320e67f

Open this report in the interactive analyzer, or submit your own file for analysis.