Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b26cead7537a8e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 03:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d1026346cb4a379375822fbcef01e36 SHA-1: d1c06b576dd6bd8da96844a096aa02f32c1a8614 SHA-256: d5b26cead7537a8e0c56b357885102464d0f31cec40ccb7ba01f813c4cf84e76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised CMS uploads and disposable domains. This pattern suggests a phishing or malware distribution scheme, where users are lured to click links that ultimately lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://szwygs.com/upload/19491199946.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/sujijawejiwi.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613249d5111bc---dixukawiditujamo.pdf
    • https://v-rshine.com/upload/images/files/7537352766.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dff6ad64dd653c9a2900b78a9fed17cd/75544824918.pdf
    • http://sms-dk.com/FileData/ckfinder/files/20210914_55A59DDD7BC9C733.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e213ffdbd60320d664b258967058ec07/41741474027.pdf
    • http://vuatoyen.com/uploads/userfiles/file/25461828042.pdf
    • https://leresto-niort.fr/images/userfiles/files/46601509597.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/godudalilirujulafupu.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/77320022035.pdf
    • http://foxgraphics.paulsfashion.in/files/jomufimufezogesagafuredef.pdf
    • http://ehomerealestate.org/images/file/17983137873.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161392351ea965---fobixizitibajinori.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/64057261736.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/12843283922.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/67969796585.pdf
    • https://portalbime.com/UploadedFiles/New/file/dalujefora.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/pekumasopixuwozalele.pdf
    • http://sicilalluminio.it/userfiles/files/vejesozaburi.pdf
    • http://szamosiszerviz.hu/feltoltott/files/jafoberesotodirikovulir.pdf
    • http://lignumweb.com/site/webroot/uploads/files/foxawivifofixari.pdf
    • https://junona.manyel.website/images/uploads/medium/bibiruwotatududusu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bangla+tv+software+for+pc+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b638.bin
36da6a6f166b289d0e97ad87b83e36d2364ec1e185ef9b535a271c2bd341f65d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 10908 bytes
font_01_sfnt_off0000cf88.bin
d48dd88a959c6537d22aae6b4e391bc1e2713886b2c3620531e9a6cc560de6c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 17880 bytes
font_02_sfnt_off0000fc8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 16792 bytes