Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42af6778000e959…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 09:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 046ebcd0bff30408ea2f40e635912f88 SHA-1: a6311df556fa909054408a3c65af0dd0cecdcf8f SHA-256: b42af6778000e959253f97cd2e20ef5a6a6a63239398f734775ca40e73a9d7ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic firings suggest this PDF acts as a link farm, likely intended to redirect users to phishing sites or download further malware. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=home+design+3d+freemium+apk PDF link annotation
    • http://sampoernastrategic.com/uploads/image/files/jetomipojekufib.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109050119088179.pdfIn PDF document text
    • https://laser123.com/geektic/files/63838857074.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/gilikomowafoxatumuru.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/47497533950.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/4115265464.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/tolijulewuruwosojejolu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cce118f4d5e0d2eed7d3377a3483ebdc/4868326032.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080719563546.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/bokadotafefepi.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/widaxuzinazijiwisiwuv.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/24798020916.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cede511013---54064956277.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/98021358575.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614273016c98e---21855452128.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/4829376302.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/64590000903.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/66175951309.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/luzuxubewukoji.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/30595871510.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nowaxumew.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7e22c8e529d0b9ccccdcd101ba12cfb2.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/xizusawukev.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/nexizoxivotogevasili.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/34289347356.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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 11052 bytes
SHA-256: 34e0bc9c21903873a31c6568e8c73b85c94eeb45e44f5d865925aa569b7a4607
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 18172 bytes
SHA-256: dbed40ad99b9ef8c49b80317c501bc81dee01039de8f352675d10bd329b3a78c