Malicious PDF — malware analysis report

Static analysis result for SHA-256 337ca303ac76c619…

MALICIOUS

PDF

99.8 KB Created: 2021-09-08 05:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae853ec971173e8b02047d71d0d17c52 SHA-1: 71c2b82874f74ef0901e5fd6d7e679d7983c6b02 SHA-256: 337ca303ac76c619107fc738d2e556738a761296fffdd5553d6be28904c458d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential phishing lure related to certification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=lean+six+sigma+green+belt+certification+pdf PDF link annotation
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/zatikefase.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/86533416500.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/27619097203.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c55393eceb8---59739900569.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/98332822677.pdfIn PDF document text
    • http://jarosi.hu/files/file/kikav.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/50833297415.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/98541983695.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83bf5a53bc4605c13b132f0f7c3c6e0a/jomokuwi.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/gijinulapuxopewewuta.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/55951275833.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jf23ajsk9jd4odf1llpvqngc70/74672634798.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/nasutararadoburapuloxom.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/35867535693.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/jomajifanuninikamoker.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/8369438967.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5ab59073cc9edda61c777dff6ab82c36/pojularesogukajito.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9b5822bd3---fitebuxedoru.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ba00e57ce---23843668804.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/saniwesegesugamipi.pdfIn PDF document text
    • https://europartner2.pl/uploads/puwevukadaminojafuk.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/27328074650.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf04fa5c55b---81139085858.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/7359611297.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/87d2cf52500acad53a0fdc317042c33d/44833045576.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c1e015d3---86894850010.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_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 11164 bytes
SHA-256: 20dedc0f21fa4caf7d1c4601d4ea5ee1abae039849b9b05626cc6b4f341adace
font_01_sfnt_off000136d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D6 19192 bytes
SHA-256: 329f82608016ea7b919da695e55744c9cfbb05cb968534280a900a61827526cc
font_02_sfnt_off00016940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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