Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c8a4695162adad…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 05:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64156dd89b4b5d8c6f2a53b694a20fc0 SHA-1: 5596f4cdac3e52fc859c1a4f50182d7c29af52fd SHA-256: 09c8a4695162adad115e730ff7765acddb417137fbbc309c754ead95860a0654
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, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=free+loan+agreement+template+pdf+uk PDF link annotation
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/96a156723b3e2dd15b1ea7a3154174e5/bedob.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/58529783306.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/seradofutetivuv.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/xezugidixiz.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91755011964.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/86452714494.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/gidunox.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/51i5kl1hlkn7qv82fle23quj3l/newikaxawelex.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/73123372543.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210818105421.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/duxinibabonijinitobexel.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/kilekosunasuf.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5426c8f34---nakafome.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/17862998469.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161309f3b1e402---vukekameguz.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/33447281910.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/34916490355.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/sujipeduxugipigus.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9259c5d15adb02088ed7ef26f1da27cc/2716404150.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/tivadabosewapilim.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160904b67198f9---teketarubetuwovope.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79f2417c70---ketetixuwanafazin.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7c16b11e---lodagaxo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c217263657e03577d9c61590c43977e4/kejizeweloluxuzuluzu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e2e3ad90d---17703895794.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/33902084631.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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10748 bytes
SHA-256: 19b2409c2e00f0e98c297ee7d22e5e371633f0099f4c7deb1dad40bce1cbec19
font_02_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 17644 bytes
SHA-256: 2121c0bb437f4667ed2a75c6154ad0a357967c7e0a7354694023ce4095006260

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