Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd15c662c1eee117…

MALICIOUS

PDF

91.8 KB Created: 2021-08-14 12:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ba58884bbeacd8c96bcb3bc617ea57b SHA-1: b9200a6f2188ea7646e4662d51c18cf5c6596c7d SHA-256: fd15c662c1eee11716d89f86e54e91cab8f59f67d673ab7c4e4c5da78556b0c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://parfumzone.ro/files/file/71942058897.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a6a7b00c---nebuled.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/fetategivebulogajel.pdf
    • http://msslink.ru/userfiles/files/zipevobod.pdf
    • http://kayamedbursa.com/userfiles/file/jizozedegidobolipozepu.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/dotagivajejojetetijumoz.pdf
    • https://alshaabcoop.com/userfiles/file/nifewapebenaxolisiwivavur.pdf
    • http://ffarchitettura.it/userfiles/files/18797278122.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ab1edfe8d---46426693701.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/79548073268.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4d170db1---9549935685.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe3aafec645---kosazogosax.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c872183c264---wavireradobototijid.pdf
    • http://quick-thailand.com/images/uploads/file/38956367809.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210807061959.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/79110131435.pdf
    • http://olech-rzeszow.pl/userfiles/file/xonigewilitopedoronabo.pdf
    • http://moscowprice.com/content/xuploadimages/file/pakegakelusug.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/159806fc73519eace18a75a078225227/fejedonavapa.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/6d57cbe7ec1fdc43f5e5ab01d88c2823/35012153549.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098347e7b997---69745109384.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1ff6d4529a03819ad6071e354d6105cb/xamafolakufigusur.pdf
    • http://timeyear-v.com/userfiles/file/41015175670.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/m5o1u8qsopperliqrro9i9mn1q/dizaluxi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=always+run+as+administrator+windows+10+without+prompt+registry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 16792 bytes
font_01_sfnt_off00011471.bin
152ac9f6f702082253430578b6fc522ecd2f444b745e9f0240558fc51625a363
pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 18664 bytes
font_02_sfnt_off0001462c.bin
fd94178464b3bf842fcaed20ce05f6a998ae3cf07b156bfa3049df558848274a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1462C 11296 bytes