Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13536af480ee2e6…

MALICIOUS

PDF

76.7 KB Created: 2021-09-28 08:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96356538644461cf114fceceac4d7530 SHA-1: d571cf3a4fbd99add27392ce4a9fcad8c578fb0e SHA-256: a13536af480ee2e63cb02b1980116006ba129dbccffbc57fa30e5862f143abad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm hosted on potentially disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristics and URLs point to a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://coretry.ru/uplcv?utm_term=air+supremacy+mod+apk PDF link annotation
    • https://norservis.info/files/files/badalopumosodanugoruveje.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b629015823---situzipedefupaxomiput.pdfIn PDF document text
    • http://freestyler.cz/img/file/luluvekibegizotemiwa.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/96758031335.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5b3edc0ebee22b88c28ea04d69eba4da/panutomumudiloripi.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/72934630568.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/dusug.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141360a63521---wavoj.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/vawaki.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/29473362888.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/63852870c75187078a001644c3b887a7/sisusitejifudoxuximiwewe.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/68643133840.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/61840832176.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d1a5d9a52---nuwilelowa.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/49632985184.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/zinevesagosapizelekimutu.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/xefitasup.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/zewurapoju.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/92610028763.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vowolirisikezukexoxel.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/libij.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/zisolelejeri.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/32683840762.pdfIn PDF document text
    • 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_off0000b0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F5 17476 bytes
SHA-256: 1fa4c5c8313607f2743ea645f40db5948e7df3598c8fd8db07370df61fa319f5
font_01_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 10716 bytes
SHA-256: 79f91b8801f4de222a009d30576e8c2b5592bce8da8f71d782f9a23a4a9c52db

Open this report in the interactive analyzer, or submit your own file for analysis.