Malicious PDF — malware analysis report

Static analysis result for SHA-256 100ab4224a5978f3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 21:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16aa02a6f7e926b1ca8f46f7c7760d9e SHA-1: 837549c233c57a6c42fab761d2151f8fe7ff11c7 SHA-256: 100ab4224a5978f376b49456a7783995762fda03769269d946998e1b255fe093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The presence of 'utm_term' in one of the URLs suggests an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=fifa+free+download+apk PDF link annotation
    • http://tornyanggrace.com/upload/file/76814158539.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613521badc564---99980188643.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/makiwurepin.pdfIn PDF document text
    • https://kawanmto.com/contents/files/21873250860.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/rofuvozerov.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/leboxuwize.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/badufibekabepeduxije.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/69583899467.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090405195673499.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0561a31b4045409ae910097ea6018eb0/liron.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/kudumozu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/nusojivilufoxobupika.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/35312094193.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/luxuw.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d876859d5a---21111392524.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/72279076648.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/rewebesiginivekezejev.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210831233244.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/34182563699.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/36840717858.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631282069.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/lekida.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/22228889296.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/49880622398.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/gixogakaxemi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/vejonedom.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_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 10380 bytes
SHA-256: 75ed1525d14a9402fe1083c87b5172236857259550511956eb4b05ecec716e13
font_02_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 17880 bytes
SHA-256: 1b9c461f6fc40dbde8c9ee73e87b31d465927ce851ca1a299fa66632cbc6689f