Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95fc319652d5b50…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 21:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 715adbc435971fb7c078c0dc2d3281c2 SHA-1: d7a4d192b41577c788b56893e78623601459475a SHA-256: a95fc319652d5b5075e6209b7d7dfa1767e4d7f52f055be153599ad1187bf503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary intent appears to be user redirection through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=heroes+of+might+and+magic+apk+download PDF link annotation
    • http://strandedtattoo.com/file/vorodimotatepak.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ogandp9dp3aqvtqkfn0ahsq9p4/guguwavukab.pdfIn PDF document text
    • http://vitrine-prof.com/files/88357392354.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/63495269397.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/rawajafadifagumanoken.pdfIn PDF document text
    • https://windsbs.biz/files/file/tezevopan.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/bakebelajosawoxegujereja.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9071454834.pdfIn PDF document text
    • http://mlight.cz/archiv/file/89722300751.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/sikoletesubebanepufiwafe.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/senopajituvikurojome.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-14/20210914055127645153.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vetisubofitujekiv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2680f6b7885f149788dad6fdcef6d22c/savaledigizutoxenumiri.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210904103526.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/40620996089.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614795571822a---gavib.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/db4b4ed3e19b94b757768be4d175203f/munevelexavufawonusixunuf.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/masemus.pdfIn PDF document text
    • http://hainfelderteich.at/jarefe.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/mededalidisikitutav.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091403305851.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8b1b10f56cf547cf6a87d08f252d17b0/metomarowu.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/zotodobilotawowugex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 16752 bytes
SHA-256: d0f152b86e24223bc22b656812dbf7c2aaadeee419344ae4cafecd66c79eaffb
font_01_sfnt_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 11236 bytes
SHA-256: 3346e8ff61b1e49cf0f5e39de562a59eb069d609dfc410c5f430b842e5d00afa

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