Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7507919de9fc0e7…

MALICIOUS

PDF

78.6 KB Created: 2021-07-04 04:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 261c570836d387b3a51dfbb6f8ba8845 SHA-1: 96885ed989c6b93f228d38f1128ad65fe557dc46 SHA-256: d7507919de9fc0e741404506931dbe092047ca68b879a185186cb93e58359fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs and link farms suggests the PDF is used to redirect users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=police+chase+apk PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f8ac17e9---bapapakupofixaniki.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095876f9e1ea---62686668063.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/40120dc5b40f935fd276e4ecfb863409/somatubisebofifumi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ccissahc7v402uckgiss0ho976/65565555649.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2687bf18ee---zurejoja.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/kewibalabaludeza.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/66433840817.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/33246424866.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/95053264386.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kimobavokiguvet.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a85b50030601103b6e4cbb4aa8fee033/40007273837.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39879533ef6f96ee2ffade713b9a2fa9/lawubekaj.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/88332480712.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080a72276001---28100731349.pdfIn PDF document text
    • http://vhktn.at/images/content/files/38515074289.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g4k76et9tc61jmg0upgteni9cc/wumobonopogexigoput.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/boxojakizubawa.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/92730523237.pdfIn PDF document text
    • http://hasyo.net/files/file/70018213677.pdfIn PDF document text
    • http://meyras-tourisme.com/ressource/site-image/files/majotopojojuponesekipaxoz.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/22376671336.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

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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 10260 bytes
SHA-256: 71f5cb13e5bceb3bd9278e2e50d6795c8a4d85839fbf27aa8cbe7b13267a5d4e
font_01_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 17444 bytes
SHA-256: 727621928e7f6995e58ab05d9297a1a75e98ce754aae1cef3461b3412e7cae55
font_02_sfnt_off0001158b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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