Malicious PDF — malware analysis report

Static analysis result for SHA-256 086f5ec9cbb2af59…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 07:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7aa238f283ccf202d40892f6df9628e9 SHA-1: bba69763277e4092b4f4a55e5eb8b4b2cd3d1f8d SHA-256: 086f5ec9cbb2af594afe1e120102a1a1abcf08036f889985dc97cbd8db313185
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the nature of the attack.

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 http://ratchadatitan.com/UserFiles/File/ruwuxukozowo.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614049c771e0c---19378930707.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/laloboripixabal.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138971560f29---90512147127.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906085234735.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/53561138734.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/59798366048.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9f810d86---19513096398.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/10582986251.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210908015229434.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/40350507639.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/wekigidotifike.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/diloxenino.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/9096758602.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/ruxexopurowa.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38a0526bd---83203032670.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/gafilalubajuforanet.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/metazeviwasubuwusavuweg.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/96744933088.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51351184965.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/53009735947.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/55426858457.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/id31206ej7pmeoso2rgkb5l533/44125292703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=good+secret+questionsPDF link annotation
    • 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_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 10440 bytes
SHA-256: 7f0da7510b6fe5b338bbcbc0041333c6b69d5e1436e7e12a0fec17f2a413638f
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 17096 bytes
SHA-256: 498e7cf0d074e92e13e6928b52d0db2af7cff551773ac85541eed5b2d8ed8696
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1