Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef187de5010a9401…

MALICIOUS

PDF

77.0 KB Created: 2021-09-22 19:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4bdacc333aad38cccbbd085491f58ea2 SHA-1: 0bc986682293226d24799649f83bcc5b83407244 SHA-256: ef187de5010a9401fade359acc8c39458c0cfb1109aaa72217340180b3e9bdcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=android+recovery+apk PDF link annotation
    • https://baxsporthorses.com/userfiles/file/guwugez.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/rozubewuxidazefulox.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/ruxis.pdfIn PDF document text
    • http://getdol.com/page_data/file/lexemixitupa.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210920065031_y5cus7.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/pamozejazi.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/98886861247.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/notomupanadi.pdfIn PDF document text
    • http://klemanpince.hu/files/file/79408230027.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62716e169---10305832784.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/34832952626.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/57175725099.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wobipo.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/xivadepowinekab.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/26192498559.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/86862884081.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7305d595b---27765226651.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1465899f16296a7997f2a024a02d8eea/41657568193.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/412d711aa1ba0862d9479820194a5244/29910492974.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/10136453333.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/dotidunawekikexu.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/vejoputide.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210909_42EF589357137A5C.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_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 17384 bytes
SHA-256: b324bca0e18708a8e6d5c44ce8228a600cf7717df98eaf14be12395c4a05951c
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10448 bytes
SHA-256: fcef7e9eaeea5d95f06f6df169203b9d5c7b386aa58dc81f86151da235dc2231
font_02_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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