Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafab3dc74004d7b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 17:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbbc16debb66436bc407035c256d7763 SHA-1: 917314e6835e02af438eb49d766ddc0743b19962 SHA-256: cafab3dc74004d7b834212e18149e2b910510f1a131299be7fcb9015b0e2ce1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as redirects to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://frutalmente.pt/site/upload/file/dinij.pdf In PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/273421374.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b344c6cea19---25838255933.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/db7cd9792568d9757d439e1dc8d5a47f/pukixipidijudosufolak.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/415805c32ff66648e2333fcfcedd216e/72189498281.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/reledobopufuwaro.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/xenemiwuzalap.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778f0271e7c---88387409716.pdfIn PDF document text
    • https://pmms-online.com/assets/file/nisifudarikipaxuwi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/l1ma4qmrmae8dpl3u1k88lk29k/50369863804.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/85136579227.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/73958c5aba623c8476f9e4c21608ce0b/fufok.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/99807223074.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161132a2b49211---genojozafanix.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4jem25kacvhvv1j3970kghfvim/42640964182.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/nalewofolazisokobegiteno.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/falanusuworikumolojig.pdfIn PDF document text
    • https://ghnservizi.com/file/71075534652.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/borilimezuxakojo.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59058930180.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a529b5883e---43309342021.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/37036157576.pdfIn PDF document text
    • http://indel.sk/userfiles/file/vaxuwudovutukomupala.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/1736280758.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68cc3d52d---63685196200.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/93385903947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=symantec+endpoint+protection+manager+14+manualPDF 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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 11108 bytes
SHA-256: c0560980a65db343da1e3711bed4453fb564a5b019cf79fcbf7bc4ef99e46ea2
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 17484 bytes
SHA-256: 06457ceece29629603bff6d04a384cfcd3f6c7081e757d6a474b4f522c8f20d9

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