Malicious PDF — malware analysis report

Static analysis result for SHA-256 09497621e06e4334…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 04:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35fe71dfc5acbd719c05eb19c4c52a62 SHA-1: c19e3737159a5cd62ce842e30a794085e38db5f3 SHA-256: 09497621e06e43348ce7b0164f9c9dd2775de7c6b7ac6b0b943c619643d5853c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These links likely lead to phishing sites or further malware downloads.

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://medvor.ru/uplcv?utm_term=na+atomic+radius PDF link annotation
    • https://all-stage-meditation.tw/uploads/files/6130f1f6202d7.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/nalifafevekuzanedosoboxix.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/rofupixaw.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/jebigut.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a5712ae6be01dd7a777e8f41f0cd13b9/retetemim.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac876528cd---nowisip.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac71612d4c---19409096221.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/91690552955.pdfIn PDF document text
    • http://gyliver.ru/files/files/17006891251.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/96317613051.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/duguka.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/95019735428.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/tobopunalovugom.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/5542601889.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lg2k6dskllv2sbb196jvj9akj0/zuviwodubukularifeja.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/74732194166.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/57740375131.pdfIn PDF document text
    • http://cwesp.biz/upload/file/samupirosu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/bugagupukop.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/64282885599.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1471030e6---10096681483.pdfIn PDF document text
    • http://pasaru.com/upload/files/miwajelodekuvakepebedej.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/58617830928.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9993d8fb---45458412612.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_off0000c699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16692 bytes
SHA-256: e741059c2a82e900b71649e8427e92646d00bc41aa15a3df6a4bfb5595538bfe
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10324 bytes
SHA-256: 2c57de44dc8dfa0d2825287aa78c178e210541bff86b37a7ad45b43109e14fbe

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