Malicious PDF — malware analysis report

Static analysis result for SHA-256 acde67084753f47d…

MALICIOUS

PDF

83.0 KB Created: 2021-06-28 00:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d39ab4d78a6c9fc218c2b98e0540f31f SHA-1: a6dab95f332d76d120f5477a1f15b555a4ac0c6e SHA-256: acde67084753f47d0078f8f7d70e681f8e82a7166d8cddbf869d9790cf4b17ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving phishing or malware delivery via these external links. While no scripts were directly extracted, the nature of the links and the PDF structure suggest potential exploitation or redirection to malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://toptenstudy.com/upload/files/BodyFile__60BAEDF794B68.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/521946f957935f1d1f27da9e78978ecd/39031610977.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/197331472660bba7a84f033.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a9813bc0---polinikipane.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaad1c2cc2---zovegajosomijalifixad.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075496e52725---95410613828.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050306213973499.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cf370acd33329f4beae3cbbc405b2604/86237396656.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tocpqmk8dhpq3a83sdh6ap19dn/puxajodoru.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e819fab65e5f729a652105e4412313e6/99344000510.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7f3dcf4a9759fcbadc3b9f3192811fc6/4724332482.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077895dc7e21---70387816134.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/futiwagakidutafi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160704dccce8c5---pedavakimikuvibawam.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zefudonitakawozegel.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/42589adc208fc8e31dad57d4f5d8d21b/jumag.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mj2hrd47oc4u8jt5e3a6fl3rrq/jisuka.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/30d047229273a33b834dd5122f423b03/54353990157.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/52615636497.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sodosiwejuv.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf95ce19b7c---sutapawisuj.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fbritah14pmdurrjor8u2k3bku/luxunefufoxezegude.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/c4vajbsrnb72hk5emib3pv808v/19825426477.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49744d203---vidifofusovuwijifufitewa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0021d77abc---15397564902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=eigrp+configuration+in+packet+tracerPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 18364 bytes
SHA-256: 369f7e41f94768fd14052599c9c8fc7da4ec50fc223430052350675e5e92179c
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10616 bytes
SHA-256: cfee56c835260f4193649c16dc83d89c6f70f6e65c8cf74b394176f27a418298
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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