Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1225e3389230ab…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 03:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c12a776f60fdd7547ca2da74bdf0dd84 SHA-1: 4e6cfce6a5c9d23e9eecd00414ea891b054d914c SHA-256: fb1225e3389230abf27492695999993f4d2b8ddea377389ba222724851a592be
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

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://www.eurosecurimed.com/ckfinder/userfiles/files/doxekizirajafeweje.pdf In PDF document text
    • https://agermag.ro/mm/file/linekonada.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/902457069.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/pizediked.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/bodavomitimal.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/18639211661.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/5606927665.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/zokizasolugifividerizene.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/wadawunapi.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/kojesanapaserubopajutuwa.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/6261697484.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/13805181205.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/70m3rtbind30tgtsnqmicksjpi/vatuxazu.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/83191169552.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210911042349386362167.pdfIn PDF document text
    • https://phm.vn/upload/files/26503626238.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b1ba57801---zujegagukeseloj.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/vajikofilarodinewa.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/20889435438.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/kajopojawuvewazaz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161322d85b9973---24582686258.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/zefupix.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141df0088e1d---2731204534.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_FD0600FC25790580.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/45075156006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=data+saving+tips+for+androidPDF 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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 18168 bytes
SHA-256: 97c72fdea5f70f271221b5e23710da3021bad4ef574b4cee6b094d30cc71a08b
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 10560 bytes
SHA-256: 14819bd68960a1b54785a982695ea51db4e421bfe02f39940168f9c7a7ef1cc9