Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6bbf0990de1b37…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 14:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 42cea334950ca6ee07a65ca7b2e0aacc SHA-1: 95e84150af0cf85dfb7d8f8767fb45ebdceae4ed SHA-256: db6bbf0990de1b37ed45726606df22e3d7a4ce01da2b7311b801511ea57c4d78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains a malicious payload. The presence of a link farm pointing to compromised or disposable domains suggests an attempt to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit vulnerabilities or trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leosservices.com/userfiles/file/babufeviji.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/904a278498b2bd27b6c3b05af74eeaa2/40296290200.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dio55ei2opfg8lfrp5c0q6un4q/74266591400.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/mowesudusujaka.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///jetufugibubukokamimojo.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/65211262926.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/32206160266.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/77be3cdb62a3e2851936763841d10d47/serub.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xunujepagonurof.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a829ed66ee6---gowemixuxetusuwu.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a0541fb47446f4dc68b3820e01bea832/betusawofa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8e4297c6---rupanorugarumipebow.pdfIn PDF document text
    • https://slide-bearing.com/d/files/fopagosubogejawew.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3r72s4ji4e16l62qvcrkjqk0i0/94354380431.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/54598894908.pdfIn PDF document text
    • http://www.asslar.de/downloads/lexob.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080e2f890c31---29468479649.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/rezasizivetulupodi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d4eb4ab2---nibusamisores.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4026de73---bavagod.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/dubaponinekipopamivujefe.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/78567184565.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/zixagirisamizefof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=science+class+6+chapter+14+solutionPDF 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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16604 bytes
SHA-256: c67424c57a90c04decde5e0cfd4217dc499c0b49450647b694f5415105d7e882
font_01_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10944 bytes
SHA-256: 3cb2d07d52bb4309e98c3d6f3be362fcba815e819b57ba3209d08500355e3063
font_02_sfnt_off00013041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1