Malicious PDF — malware analysis report

Static analysis result for SHA-256 073c431d88d3b20f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 05:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb6fe895f20ec75430101625d5f1c936 SHA-1: 1d14be95e8bded034c74611f6ad44fb54df4e221 SHA-256: 073c431d88d3b20f2b51825bbce9125cd4a9a7e824711ced99ba2bec43225aa1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The presence of a URL with 'utm_term=among+us+latest+version+mod' indicates a potential lure to exploit interest in popular games for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=among+us+latest+version+mod
    • http://agroanaliz.by/upload/editor/files/xipesavarasofugewugi.pdf
    • https://skl.deindrukdemo.nl/upload/files/52758330112.pdf
    • http://ferrocom-spb.ru/userfiles/files/8621478728.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259c2c2c11---2778703879.pdf
    • http://www.gdchgs.com/admin/img/files/jivifonubofidizurasu.pdf
    • http://www.derbysignandgraphics.com/uploads/file/27023620490.pdf
    • http://nabisori.com/userfiles/file/34444548667.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0056e33009f024549e33e9ab17bdf6a3/60684138110.pdf
    • http://tuzvedo.hu/elemek/file/98058782099.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd20dda0c---pitud.pdf
    • http://dansungsala.com/uploads/files/29527994275.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lvso688q4cfcl6rnf5of5000m1/kupel.pdf
    • http://pushgroup.lv/userfiles/files/44881507783.pdf
    • http://liily.jp/upload/file/20210906200612.pdf
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/keluxidupovufox.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ced91f344---logusebew.pdf
    • http://huzatfokozo.hu/editor_up/luvurobiparedezarozimon.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/bosogiwulefejabuj.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/76551384373.pdf
    • https://mimpishio1bet.net/contents/files/tedufim.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7db7e77ad---bevulozuwinesoberufunekok.pdf
    • http://viorina-deko.com/images/file/dijejareluxarasare.pdf
    • https://rougezenekar.hu/files/file/43984481901.pdf
    • http://rayhovietnam.vn/upload/files/56046228840.pdf
    • http://pmke.cz/pictures/files/basuxabipofajex.pdf
    • http://pixel-pro.ru/upload/file/pikopalamada.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/79022426979.pdf
    • 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_off0000e2b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 16792 bytes
font_01_sfnt_off0000fac8.bin
88df1b4937061649abb74680c7a374a599cdc6e7d2c60dc95d1db4e3e1b35b09
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 10736 bytes
font_02_sfnt_off0001134d.bin
1293c85d2facb1d75e4244d4b7882b738ada37fce3598cc941b7fa73186ec008
pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 17560 bytes