Malicious PDF — malware analysis report

Static analysis result for SHA-256 1624b6b2f1f29dcd…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 09:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bab12153ce2e3e45a6e4568f1f5ae719 SHA-1: ed5ce820a5e416f969da2c93ee79cdbcca9774b6 SHA-256: 1624b6b2f1f29dcd3967aefba476e51f290d23a1124e1a2936443952750387c2
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some of which host further PDF files. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing campaign, likely aiming to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=yaesu+ft+101zd+manual PDF link annotation
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a1c74e73198c6ae818fe434cd4ca8093/8073248316.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/945d245b80ecd54e37b96fb279c3e207/zaxomepimofizof.pdfIn PDF document text
    • http://www.toptehnik.si/images/befege.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/68439577494.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193121424444.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/zovolaruwepefe.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/47834935934.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kvagekkmh1da1bgsndeme299t1/74030712402.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/77060446435.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db590d17e2---nutagedesi.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d8af1f5df6c7240fa9e083646fd7f8a3/suropabobelafi.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/sixewosesokudomasafeno.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/55025333919.pdfIn PDF document text
    • http://ducnhua.com/upload/files/watejejuwilu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/11603332902.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jekumakefek.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b549323b21c---79396159265.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/feehp7beir15dcfl7q8ee9veh6/xakox.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/24989430122.pdfIn PDF document text
    • http://tiquital.com/documentos/file/gitep.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c1a43601---sogixujawopozenejud.pdfIn PDF document text
    • http://capri.lt/userfiles/files/wivesilowagodanuzaxurugaf.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/gasakumawijuraputu.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/jarubajatafezoguj.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_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 17812 bytes
SHA-256: 6a1b612c88f593968c7cee0ab7763596bec3ca607c1f6cf64f8129f1c6836bb9
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 10520 bytes
SHA-256: 1ea2552493a96df27a6f6371a4ade8049559e5f87ae61e6f1cf96c8deb334465

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