Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b8ded0cbf97e0b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-05 17:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efe91a5720322c381280b38ecb3d66f0 SHA-1: edf188bbaf2deb917693124e4870ce10f046ebe7 SHA-256: a3b8ded0cbf97e0b6f9226301f95be87658778685dc602c53a454b0427a4ee8b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://auto-rujo.com/images-editor/file/lovixopulalobaredi.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa331c9da43---gepixo.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074917c58583---tixarijilesazomodimuf.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/tavimoxapa.pdfIn PDF document text
    • http://houselandia.ru/files/vixabig.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gixene.pdfIn PDF document text
    • http://co-mit.com/uploads/files/duviwusoxudututid.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609171085921f---66130530535.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/an73cpr35ab077etroj0n9uq77/64085499851.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/67957917584.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161183e7d7c304---79189324562.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/tobiviguzasiwadijosasodum.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/bf793366ca107a844d14a8bf71b78bbf/47668819409.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/mojosurojagivipal.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/aa6aa6d30c4a898ec3d285fd16197b3a/87568726924.pdfIn PDF document text
    • https://bursac.net/userfiles/file/dibavi.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/20435822812.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d67d9fdfa84---97915081254.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/78361243685.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/belikiwozevevelugabidiwa.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/falupakovi.pdfIn PDF document text
    • http://ropesadventure.com/d/files/69128955440.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/lupulinewadawidexoxavibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tratamiento+de+varices+esofagicas+pdfPDF 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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 10948 bytes
SHA-256: 9f765a9e7a2dc2366a300999c9c72a5fe1270d6b1526549658c9f0cea5fe6c21
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 19276 bytes
SHA-256: 063d9a6a1e5a41fe0c6a05491dd71e1f10753b6d959cfb80d58a9da6054f09b6

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