Malicious PDF — malware analysis report

Static analysis result for SHA-256 9110e7f6c4841a6b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 18:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de289c3e30b71300dee51f68f56746d5 SHA-1: c47e7b08a7894e53575ca799f4c330f8c8cf5e17 SHA-256: 9110e7f6c4841a6ba595cae07721ede24651d80cb99d3a6b9dfedb193e8a3e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to external content. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=zen+in+the+art+of+archery+pdf+free+download PDF link annotation
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/78374378924.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/98219488361.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210912025022.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/pinekajiburibima.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/75917182096.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/gokepes.pdfIn PDF document text
    • https://efnnma.org/files/file/24880030786.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/87582465296.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/lomubakegapapak.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/mobidudisisijuked.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/libimim.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/vifulareromenebedosu.pdfIn PDF document text
    • http://goldmustang.ru/files/files/44339577849.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/44393527892.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/pewepag.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/22565371601.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/91187553314.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/gupubugefisinef.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e8024aadf58765d1410397717426db8d/sodaderekipusuziragif.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/safevota.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b92de7533---zesipatawulifaxureworut.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/26601491538.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/j8tm0h4saum6gjbjamhepgrbc6/pademimirokerevigave.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/82864978701.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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 18416 bytes
SHA-256: e8f97f33313512ba1a1f093f6ce34121f29cb3cbdc644ad78ece2f5d2cbb9416
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 10712 bytes
SHA-256: bdad7a6e233e9a52fdf6768ae4c9ee54271745a4217a3cc15dc26d340f305a63

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