Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34a76498c0be8dc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-26 11:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25c67124236924607b5a8f815485ab54 SHA-1: 39fcd7a6781b33d8c096e4c3ac79221339fbc8b4 SHA-256: b34a76498c0be8dcc4c9bf3c94e27f613ab9992da0212b4537bea44cb5702376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites for further exploitation. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE+%D0%BE%D0%B1%D0%BE%D0%B8+%D0%B4%D0%BB%D1%8F+%D1%82%D0%B5%D0%BB%D0%B5%D1%84%D0%BE%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4 PDF link annotation
    • https://charterfori.ir/basefile/charterforiir/files/52749118331.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/84001616421.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/mugolaxomoki.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614690d983e47---47105780189.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/79291943704.pdfIn PDF document text
    • https://kapefashion.com/files/files/gulizuvanefipolajuwovi.pdfIn PDF document text
    • https://megalight.lv/uploads/files/barejopezenudinejago.pdfIn PDF document text
    • http://wamer.org/userfiles/file/bikivepimupidebejugi.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/20142811830.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/74648375418.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/61580802420.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/59929559048.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/80128383539.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/fokevejawivubokewowexejug.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/gefajiwamojigiriralupapo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd6ce23f1---dosovixip.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/giwupiromisosopixobaram.pdfIn PDF document text
    • http://gugugroup.com/userfiles/xilesezabifipoxoxajupe.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/43991025611.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60355224214.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/nosadut.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d7b832e0---38153425839.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71A 21280 bytes
SHA-256: 6c2c82137fe657fe119a7b92465b5424ffb83781f68929ce566bbf22fd512b2c
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 11148 bytes
SHA-256: 846b68edb6d8326fbf5d2495cf4c7ce70a07361bd87d0635a8b649312c469e5c
font_02_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 16132 bytes
SHA-256: da3599785d691edba6bb1dc804d5dbf9cdb050cf7bdfa967d514dff539c0bfb6
font_03_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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