Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a16ae1b0c4ef367…

MALICIOUS

PDF

77.9 KB Created: 2021-09-10 12:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 783e1980dc443d59e167d402bfbbfe3a SHA-1: c3582ca93d1401038dec5fe5fc163679f15b2dba SHA-256: 2a16ae1b0c4ef36715a39b52c46dbc00d78ef53b6da2b6ba920bf49344231279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of 'utm_term' in one URL suggests a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are strongly indicative of malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=ip+webcam+apk+download PDF link annotation
    • http://vipforiraq.com/userfiles/files/59469192366.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901063142_29g6yg.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/57239063343.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/46899499792.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dipigogozonurafatajifuk.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/gevirifafuwesudupuj.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/19554540475.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/40278281626.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/83956799770.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/64927933945.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/21127392541.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/revud.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/lirunimivarevupawoba.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137d2102d74a---zituzidopifeta.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16310720867759.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/31249022551.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zajufavan.pdfIn PDF document text
    • http://allycatering.com/userfiles/16321120213.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gariginovazume.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6rcrcavndngrnfea2hvkf4c1p3/52521800716.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/sixidotosonetebab.pdfIn PDF document text
    • https://airshow-bg.com/file/lututatopinasej.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b3123de8---70638735997.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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 17640 bytes
SHA-256: ea38ddeee15e73d4db4072658473ced7bd0d5b58836828e9b7952998955f9feb
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 10484 bytes
SHA-256: 30f528f61ab3bf2d656a6fcc3f7a7997566a65293f302009ad91160013cedfc4