Malicious PDF — malware analysis report

Static analysis result for SHA-256 d116e1f0711a9fd5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 19:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d905654c7cfeecfec7c3ecd75e67463 SHA-1: be5dc1e1930e037bb0d394e0a3418786919db2ee SHA-256: d116e1f0711a9fd5275e2390cfb12b0afaa263b0670cccca43e86e528dcb8907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 for phishing or malware delivery. The presence of 'utm_term' parameters in some URLs further supports a campaign-like distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=zombie+survival+apk+mod PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6cec08fe190b7587a4132b7b5a258d32/7915113891.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/31520235377.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zexowekenuzasagulefi.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/nunesanubejof.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/50112393005.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/dutolokimasedes.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161309cc5cedd2---19335030566.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/81770232528.pdfIn PDF document text
    • http://tipiland.net/upload/file/jopepegerutebatuva.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/25780991025.pdfIn PDF document text
    • https://architektor.ru/uploads/file/72415787202.pdfIn PDF document text
    • http://egitara.com/upfiles/files/diratowu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2cd1d67f59d2485e6829784274ef5f30/bipawedelanosaji.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/fusejoziful.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/lizofaruduz.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/rekupipa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c669e5b2e4628f41c9b2566e29e4fd2d/34313572558.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/61137877803.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/75476336880.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c292e38a5d30d98a3f40ae0819fd32ff/37217776430.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/18900948281.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/11435977219.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/64362130424.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/ketatezenefomano.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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 20448 bytes
SHA-256: 24ae865fb6c748f0694d52f92e55a00a78879653a552c0a9b451655a3e4c1b28
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 10712 bytes
SHA-256: 3ee05e5c33b87551249dd70462d652befb10a92254a823a254932c36aa7acda4