Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c24790f8f4837a…

MALICIOUS

PDF

79.7 KB Created: 2021-08-27 13:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1eded1b1f979b08302aa6da1778aa1e5 SHA-1: 30858974355eddfc4a45b7ced80f6a8a250b847c SHA-256: 23c24790f8f4837ac5c87b91b39c08bbd6769a2584a90cfd76ca89c89f059ac2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://justbuymeds.net/userfiles/file/xifapexorizirele.pdf In PDF document text
    • https://elearning-chemistry.ro/userfiles/file/punegub.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/kizuragibejanajiw.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a150e8a78ab---javominira.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/99771883161.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/12351371455.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/bitejoxutatewumobugezaga.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/432b9634c0e283f202b2a59121efac6b/dozof.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/nenekumirut.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/27457594689.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aba56747e66---41511670742.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/19883cd1933d4d3705834a193549598b/17108932716.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/77405539715.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51d24604---78039811437.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/756cda39eb2433221b083f9d39520ac0/kozavolazosab.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/29lafpvs39k0q4mbmurkqdaqpo/34463326521.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/pojimupadapu.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/83993067656.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mufipiwal.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e2u3oi3938e74mo7663plp6fab/siwufitepa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d65f193670265e9420b5e9c9d63c47c5/73899469274.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc4b3e814---tajawisupotileniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=modified+planks+for+beginnersPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/66897761226.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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10800 bytes
SHA-256: af621e103614f9aacbf1e18cff537756e867f7d91b5f19300818a63650e06645
font_02_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 17780 bytes
SHA-256: 91a917991c0510bfc5c4da6d3c2f79c3c6af9cf7cdd6fbc72c85bd37d69767f4

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