Malicious PDF — malware analysis report

Static analysis result for SHA-256 96847518b28aef14…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 10:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69c1ac872066b7238cbbe98d8befade1 SHA-1: ee194e67400525b6280083553676b599292b80b9 SHA-256: 96847518b28aef14c72558cf2737d67ea6c088c4c49a0b00e950e0a48b373372
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=quitar+modo+seguro+sony+xperia+z1 PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332784f2a46---pokewafoker.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f55b928a9---wirekipatopilifozok.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/85485341118.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210901071631_fm2upo.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/5217934107.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/19832066324.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/xidib.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/27518435425.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109120825566965.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/kagazawewufowozademiguli.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/wufik.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jojufilukadolunu.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/80413184934.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613426931d3bb---laguzusaj.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/boxexus.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/zigubig.pdfIn PDF document text
    • http://toroisg.com/public/images/files/jugamedu.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/bitoxozulisuvowagoro.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/15375b3d48be99c9dff707ab9f0e95d6/kisawiwuvipunibodulivizel.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/86634152847.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/48303016058.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090309445834.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/63192865985.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8922dd0e7---33679655444.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/23411504329.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_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 19232 bytes
SHA-256: 040b8afb44aa731302ccbffd08306deb9a05f6092fd3b27d595cd0e69e3a67e2
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 11176 bytes
SHA-256: 8962f94e7367523f005bb7011ab00c64d37b96f8d0d5a65d8574ee433068c335
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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