Malicious PDF — malware analysis report

Static analysis result for SHA-256 e729f7a87fd461ae…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 12:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4c1443dfd9713137f6832d18d7b4dc5 SHA-1: 1d4f086556a3560518c3167a1692f99d5eb6a22e SHA-256: e729f7a87fd461aef151c8e67ba4cd180eda15e30572d717c224e9ca52591771
156 Risk Score

Malware Insights

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

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 WordPress sites and disposable hosting domains. While no scripts were extracted, the structure and embedded URLs suggest the document's purpose is to lead users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/omu01gnc49eptrgjtts9j2ptla/perufenuripokox.pdf In PDF document text
    • http://asfus.net/virgsurv/userfiles/file/59199947435.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f4acc488---nitemapomapimorag.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/fabelukusa.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e60c56834---58636602594.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f47ce84550ef13d25f53d50b76a6fdeb/mosegexa.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vularetofexez.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930690dcd45---28314869571.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nimegiwajowosek.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/pifisenixojudi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c884641e---pejabimebolikiz.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f7f99080---25564212938.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/73384951742.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/misumifabanuzezuv.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3bb985ad15e18f3a201600fbffeaccdd/67574689800.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/19986723744.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/netevabesekobonu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-12/20210612010335854375.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ddb7fea7---kumap.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b7705109bdc980825a80e95554f21ff/sopotiparimafizawinajumet.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c507631087e---89725281792.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b0653e1cd05---toxewuxugesi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bepfq7rbvia7u2siavpj40r8p9/dejigune.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3904d6b5---larekugenilaweto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+peach+and+the+porkchopPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 10360 bytes
SHA-256: c600abc1a1d7e4f91f7a6c863ed456c0fb43e0687feb20a5554398a1a8362142
font_02_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 17236 bytes
SHA-256: 6855cddf3c051d1b891bd860244cb7debf8f9386c8845a3bcc42533f5cbe6aa1
font_03_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 16516 bytes
SHA-256: 5cd1a2096f2a85148d17a6c514bb19eb2492c279ef22ea973a884bf14802b3dc

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