Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7e31fba3b99036…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 09:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7e3681d64752463100bda1f471f90cb SHA-1: 052dc570761147b7c89ffdda960e44919a048cb2 SHA-256: ab7e31fba3b99036dbea4f8cbe00ce5659d2188c23c6fb5b56d31751e52bcad5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of using password-protected archives to bypass gateway scanning, implying the linked PDFs may contain further payloads. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ledson.ru/upload_picture/88780881748.pdf In PDF document text
    • http://pmrs.ps/userfiles/file/50304589512.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/80905630029.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c9d264505---9422224899.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/53979109727.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/pigufa.pdfIn PDF document text
    • https://hirurgija.me//files/zawovokonikuxuwi.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/tobedumemifixikitij.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/61923246011.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16104486d999da---veruvobitikanesur.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd89c2dd9a---dilafep.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f51ead1b1ae4b8c70ffd596170a01236/taporobizevosabobusugeje.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/18076028219.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/buluvupodo.pdfIn PDF document text
    • https://langumeistras.lt/i/File/10420675246.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/50006293353.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rokiriz.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/88462207615.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/52a23e4ca0e6a1d7cebccbc132df7e27/67317912194.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d470faa830---lapeta.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/zavovowirudedivelasinu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b249cbf1b28---luzikezaxejaxakivu.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/zifetevapokafolisipaxom.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/98074409213.pdfIn PDF document text
    • http://slsnn.ru/content/files/litusutapukeburilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kamikara+pdf+freePDF 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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 21356 bytes
SHA-256: b6fd73c96417c578efaf770ef89360542b4ae9991f99d0d079cdc58a23c5294e
font_01_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 10208 bytes
SHA-256: b9f11b838415f500ebc2b31ffa9a95d5299f039c86858de2c24b4e0c7d540f4b
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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