Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1ad079526c3c86…

MALICIOUS

PDF

88.6 KB Created: 2021-08-04 12:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e114d77e228c6b347c3cf4e275dd7f05 SHA-1: ac5e13fe06294dd96174160fba95022daaba8c87 SHA-256: 4f1ad079526c3c86a0f32c282778c4a6119c27835b73f58ac0839d3303f2b9b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://huntic.ru/uplcv?utm_term=how+to+bypass+qustodio+without+parents+knowing PDF link annotation
    • https://premium-house.uz/images/file/xedimini.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07afceb8a1---11592968323.pdfIn PDF document text
    • https://yorapp.it/file/xanit.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/jiwuroku.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/48338318888.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4518e0509---welakixiforotimipuzokovan.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/4597398323.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b1b533a2e---gebizigezerenubixudus.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/fazuzaxebesax.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730fea56295---mitagodofukologunej.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/nitavidiku.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52cffb18dbe0ef4ca38cee7eabde7a03/peramitalurabunijetimeme.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/56531087563.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/0j9povfc5muqcrrj0st94osdal/pubad.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/157df09a4746d4a014af9eb6ad837b16/jidilawuj.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b3b7a0d8bc5abbe83333f3bdf5481ef2/lovixijix.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/91215421126.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/tonevulisagot.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/24786833478.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3fkqirpk6r3j5q3130613d1gn3/90970670399.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zudalimiziliwukel.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/37444997441.pdfIn PDF document text
    • https://businesslife.com/content/file/larobofonola.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/gudidogedefaw.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a116019add0e0be4d43090eaa1a5f909/72154856469.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_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 16888 bytes
SHA-256: 31ec462872d094ba2610c16a9b0c5b5c3a04d331a51ca2c41b2a267204f4f027
font_01_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 11292 bytes
SHA-256: cb15c7aaf19c25c7a89c713dab2fd5bb258e6f120897565fdc3b3690281d5c2c

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