Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea5475b63ce2175…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 01:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6778072789ea87e4094c7d99c2a1bab3 SHA-1: 19f664b0da5082f8316dd0fa2373de1d8efaf897 SHA-256: fea5475b63ce2175c13ef9b1509597e9ad913d27539bfd9c1b0e82820add94a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other potentially malicious domains. The presence of embedded URLs, even if some are marked benign, suggests an attempt to redirect users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://saigonradio.com/userfiles/file/69141569236.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/45c410c4ac405646d41e1bb273e93203/80276973509.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/seloluzavafidanipebutu.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/motufimulunefetuzigomal.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/71242705353.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/wapogoze.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145df403ec2c---zuzudijepumosaxibapiva.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/28896542471.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/dezikekobimotunubovalubix.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/40653231742.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/3176672656.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/razevezurobuvobor.pdfIn PDF document text
    • http://epmachine.ru/d/files/55358533015.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/46307502724.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/93300287156.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/sepikuxezejup.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/metepuvuguzava.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/rudoj.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161315cddcaa45---fevanovovuguje.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/xajerojofa.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/gimuxijefagasorisor.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/70031513477.pdfIn PDF document text
    • http://rc-modeller.se/images/file///runibumuxebeledi.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/vajuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=installare+android+su+netbookPDF 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_off0000ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 14732 bytes
SHA-256: 3672f0ad5574ecd25dc0163795d221b1c0494b29998461eb75562963c200d101
font_01_sfnt_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 10524 bytes
SHA-256: 46044ee0ffe0210a5995a2c1c4c11d5849a31204497dc12a111e347ad96d5dac

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