Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e99a52c3995c35…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 08:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d80e1cb03d24d900e9ef02a0c751862e SHA-1: 578334553359a781e5a36bb5e056398788a79857 SHA-256: 04e99a52c3995c35954b4a7c238f9f23fb734583fd225b7963ade406ec478dba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://laborke.ru/uplcv?utm_term=what+do+you+do+for+living+yahoo+answers
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef9ec1547---11634752262.pdf
    • http://abacusnancy.com/userfiles/file/70825446594.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/7287115040.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/e992efsav7tor4ujb6oit5cpk2/75669730093.pdf
    • https://soft-print.pl/app/webroot/media/files/31553853769.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888b8c9b1ed---5384082593.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607baed3132a1---faderifaretozipisuno.pdf
    • http://stolizstekla.ru/userfiles/file/62747265364.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c7ae0121d---fujaxo.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ogkntat8n556cv5cjir44jiie3/98002563850.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a68fbc371da44eef79c88e5ac520dbd/fujipisokomi.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d353c22863cdeb6667b99d6514722607/lugoledularubegevabiwevik.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/00i38uagalkcn5aa7ag326tqpf/davusonibutixu.pdf
    • https://rintrans.com/files/dutoresitaz.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae627ca02---38248671779.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4d0f17af1d9f6aeb83b1a9602d6a46e8/xakupuv.pdf
    • http://sushiloverca.com/uploads/files/51734899056.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a67e97d18---72794470450.pdf
    • https://ebooksweb.net/files/file/lovefolunulijuro.pdf
    • https://psychologgia.pl/Upload/file/84428785316.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6f89237aa9f05c239c45719ba4ac0106/35708806292.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 16792 bytes
font_01_sfnt_off00010220.bin
0f3b5fa270546e71fc98001a90d250c55b8c3adbb7abcc844d0ba4c8b30d8817
pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 17244 bytes
font_02_sfnt_off00012f52.bin
52e994b2c72e3d84675ababbd3cc6a2062d4c7065167edbf095d8a5dbcd55b97
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 10992 bytes