Malicious PDF — malware analysis report

Static analysis result for SHA-256 2408b89252a23f81…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 07:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af3f5fc26dc83bdfa697c4929f42a956 SHA-1: a286ae87b2e17fae47cfd81cf97af286cd00bebb SHA-256: 2408b89252a23f8135be2f0b4c82a06efdb2f7fa374d2ad2a141304ff2deaa3f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=trasferire+contatti+rubrica+da+android+a+iphone PDF link annotation
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/73939362024.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jijaniredobuxalugufivi.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/guwudutumixijawugapapuka.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e93cda744---91465004880.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/liwipabuwodeporeruditame.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zilepofix.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/binegulagexixebi.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/xazaxanivotolibi.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210914115931_1824649235.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/78636500111.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/6760476270.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zodugixiwesitedij.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145038e512ca---nafetetakimaso.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/95681048462.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/22307650868.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210904112313.pdfIn PDF document text
    • https://hinaweb.com/upload/file/38162961638.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9020ce74f27bb6ac5f3f2a603e986817/rudomisakufafik.pdfIn PDF document text
    • http://land89.com/ckupload/files/46714455524.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a9cf26fa4f4b793d7c489ee41b520fcd/kunufot.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_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 17352 bytes
SHA-256: 074a6a37279d169982e5d43160290f55eade14baec4dd3be76c7c144b61c5601
font_01_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 10876 bytes
SHA-256: d01f76109d6ec075b4d90ca57300b772d38bfb91a4d8d1c7dc4ea9880501dc4c
font_02_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1