Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbbe56f9dd0891b…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 01:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10fe8cc75de1a69c6b5e0fa1f8fd995f SHA-1: 739dc8cb5182a06c50213c6c05cffd407d4a5485 SHA-256: adbbe56f9dd0891ba765445df54dfdc45936982f17dc751425540e76ed999d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'resume model for freshers engineers pdf', suggesting a lure. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pistant.ru/uplcv?utm_term=resume+model+for+freshers+engineers+pdf PDF link annotation
    • https://aptitudeclass.com/ckfinder/userfiles/files/91440695263.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/dataginekanutilezuje.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/89eb80ca03f9d3b09fbef5787b78e673/difiriwetopowezi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16158684343c20---68764726165.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/37528719375.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/30860335632.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7aad0749be8ed15da2c604b4d83d2aa5/30211457863.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/92948672455.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/supaporubiwalixegog.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a801635fcfe1bd1568383e1512a114f9/85033632495.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/89960481541.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16155643c0e015---pivoginudu.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/19815662338.pdfIn PDF document text
    • http://gespk.com/userfiles/file/63819347327.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613349898c95e---dexejujexotirojig.pdfIn PDF document text
    • http://szm.hu/userfiles/file/21675339598.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20211003050318.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/40880726715.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/musidupibeliporuveb.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0bd2559e99e4efe6ca61685376172bac/17911269942.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/ziximasuxakidulon.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/polexefadozosozodazotix.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rjpgcu6cad7bkghqrt9eh487v3/fomawaj.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/35726459259.pdfIn PDF document text
    • http://gaudi.tw/upload/files/gefebofidaki.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/kofopogitiromo.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/14612692076.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_off0000b605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 10828 bytes
SHA-256: 8b15de1e53f9fb7ec7dac0957a5c07a60aa5852e8ed1e7a4585faec122c4e4c9
font_01_sfnt_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 14700 bytes
SHA-256: cf42fee6a72b34676246ab1b32578a497720a8c995eb23db62bd13e0ce3e5377