Malicious PDF — malware analysis report

Static analysis result for SHA-256 b835ecf30bbada6c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 03:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 893377978c206c79a8a520460fd6eb75 SHA-1: 0eb30ce9ae91f8c49ce54c4220864f874eed97f8 SHA-256: b835ecf30bbada6c4dcfcd67a98f1f373f38b54ca0bb7b2ff4adbd9b843e83a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=customize+notification+panel+android PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005cbc66b2---87198026178.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/29443370321.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/fanul.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/65978044372.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/tunemotobifetobefo.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/96089366884.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/jedufako.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984fbb76e3---60391616343.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/munixomeruvusafimanapi.pdfIn PDF document text
    • http://terlickodds.cz/www/www/fckphotos/file/wifetazogajerumidin.pdfIn PDF document text
    • http://th-hl.com///upload/files/84190187113.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/51794075025.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210912135334_nyt9n6.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/24a7a839b40bf7134551f974a7943bd8/wugasamuduveximogat.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/86526094030.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/16535791563.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/64823832940.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/58043318140.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/retowamel.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/ninipusavojabejivopiligi.pdfIn PDF document text
    • http://willbramephotography.com/nosuxibawatunexupebet.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/saralapusafinudiwoxubizu.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_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 17368 bytes
SHA-256: 5d5b012f6e3680598b30e1fde6d404ddaac03a17015921da1701051ef0460c9b
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10972 bytes
SHA-256: c0ffa1b70a307b46ac361bd856b748fb00fb4d9a58873982cdf4601ce56c8b67
font_02_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1