Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b3639f0da2ac50…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 21:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f356cb42281672c40bd35568da771b03 SHA-1: 646b1c1d33bfbd951992ede90aec2dae0efe9c80 SHA-256: d2b3639f0da2ac50f9873cdcd2b11c95edb3d463cbb62975dd11a3ae509a5eb2
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious content. The PDF structure and the presence of multiple external links suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=short+vowel+sounds+worksheets+for+grade+3 PDF link annotation
    • https://fceresources.com/ckfinder/userfiles/files/beropivef.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/69931857217.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/lafagefujito.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb9c3c626c---lagipuri.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/zekurukesum.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7bc6f0924e9fa065d748f11def143698/68227787447.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/figebonuw.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a330f30417---32208898985.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c39956214da---rosimofanifizokurigunokof.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/atlefjl3ccc30j60jd05jrkuv5/25872086551.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/76171186284.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/3001ff2118742f66343cdd65e077edc5/kidopojudulonarokaba.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/92273610449.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/67d093dd0bf6786931ff1bfda812c032/ridujawuzibi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c956a795f6---71492512289.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/torujominenufiwedam.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/balarupujefeniwajawex.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/75902913467.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/23630554037.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/70644113295.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/94471346200.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/11672046076.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-27/20210827004705583642.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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 17036 bytes
SHA-256: 3502af5f6629a7b235cb197381b1222a56104e2c714fadf493a4d077ee9934c5
font_02_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 11132 bytes
SHA-256: a18db297883f098bca44d66c8b09e64b2a96d3eddf849ad8c51a2189e2a37fc4

Open this report in the interactive analyzer, or submit your own file for analysis.