Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9da55cc9f9e79ff…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 17:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6eae8c03861f07e6ab8b729a73af0c7 SHA-1: 6ee7255ec2a725c2d5e280fe57e021e5cc708c73 SHA-256: f9da55cc9f9e79fff8f86bb0756d537e2e45038853c5bdc5451737e236d9d58a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of numerous PDF links and UTM parameters suggests an attempt to manipulate search engine rankings or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/fipak.pdf In PDF document text
    • http://hyunshin.net/userfiles/file/57913106011.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/029d18dfd6f7e3af2bdeab7204812d53/saritufosevedifox.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/80766241028.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d801b5fbc---44588137486.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/73892506394.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/69913357868.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2342ed994568ba1e5116e22888eb9781/98854332591.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/43852458455.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/97447342360.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934fdc95e04---70780544790.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27dadf7f8---muripuzuw.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/tavepenowedigomufuxik.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/4f67b74rkqdd3i4hd0t7gqdkl6/53253902854.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/47378719274.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/faxunugexesa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f77f9afbf---20036434578.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/jovewepemuverimipum.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16083577418a30---dilutadisesibagudafinis.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/88109510225.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/4551f30c3e77a27fb63829a8e706039d/27634260159.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f544371ff---11137729191.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/voluvazasolu.pdfIn PDF document text
    • https://inks.bg/userfiles/file/19534415843.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/5e2980786fae677c65c6262d41ef7121/jaxavonomuwebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=irregular+preterite+verbs+worksheetPDF link annotation
    • 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_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 19304 bytes
SHA-256: 43141eeeb47ea8f590febcdf66d5439edebda4e324a786b805ec4bc3616c35a1
font_02_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10860 bytes
SHA-256: c8afd2817b014f56ebf7a1bcb94410fdbca101f9b7ee8b917c566cdf27cbc200

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