Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4797ea531bc1880…

MALICIOUS

PDF

73.1 KB Created: 2021-09-11 14:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7abb462f1f73b27e27468a7c6984e08f SHA-1: b5cf7699d4365b34895c9f2e08c976df7ca3856a SHA-256: e4797ea531bc1880c6a5145ad69e298d939c0ad16769262d2dfb8f6729460d06
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter suggesting a tracking or lure mechanism, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=latest+truecaller+premium+apk
    • http://vincitydata.com/uploads/ckfinder/files/lamogonadi.pdf
    • https://carcable-bg.com/uploads/pictures/files/veporaxirejesipobopuzab.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/240bd9fa8aa0cc679466382198cc88df/momamojemujufi.pdf
    • https://contact-house.com/fckeditor/upload/file/17009322637.pdf
    • http://caphegiabao.com/upload/fck/file/59758648603.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/zibamanunopovodal.pdf
    • http://intelekt.biz/uploads/pages/files/98911836681.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/51556817305.pdf
    • http://ngnjl.com/userfiles/files/suxibupixirazesinibi.pdf
    • http://xn--h49al71atridzo.com/userData/board/file/37098205645.pdf
    • http://lso-msm.com/userfiles/file/nomatiweju.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7bce9f28---gevidoxotozofipaxotalomol.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/rifojibome.pdf
    • http://goldenstarhotel.vn/images/uploads/files/14685785037.pdf
    • http://mega-treid.com/userfiles/files/girukiw.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2566575---97720777000.pdf
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/59956467001.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/26349832351.pdf
    • https://nmg.lv/img/uploads/files/dotilolajif.pdf
    • https://soudureornementalelauziere.com/upload/editor/file/74901078986.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613908384ea4b---58170082772.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/sokodilovizolafufejajilez.pdf
    • http://e-skala.pl/userfiles/file/milarizet.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/75912702266.pdf
    • 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_off0000baa9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA9 16792 bytes
font_01_sfnt_off0000d2bb.bin
db11e457dc198d24464f887577f64b35b28f12810e21ba048e81011ecd5afc7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 17184 bytes
font_02_sfnt_off0000feab.bin
33ae5f69c369661fd3be0faf821477e302d6ac36c4133da6e94257e50f3a029a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10460 bytes