Malicious PDF — malware analysis report

Static analysis result for SHA-256 f736f54fd78d210d…

MALICIOUS

PDF

93.5 KB Created: 2021-08-10 18:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86d560a50e0ecfb7c6f94837425624e4 SHA-1: e38e4dd9a4e879ca9a9fd4fe7435390ba06ac2ca SHA-256: f736f54fd78d210d5be06f37c73dad5d0e2d06d70e5ad76ae69a4fba9f50f66f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xn--z4qq44i.xn--kpry57d/upload/actfiles/wexodinuxiniresabaw.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078217154cc2---15854511857.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5ugmmjdr5jth4t6c0jb7nf2rho/57737486443.pdf
    • http://dichvu12h.net/userfiles/file/93502459631.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddb8bfeea---88596380282.pdf
    • https://angkoronetour.com/userfiles/file/liwebivegutilininopetuma.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/tiret.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d357d52b9a---xofopedune.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcad758e0f---fumikozorepigajuwokifili.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e53fb88e0---tuxisufikowanu.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/37eb882c73dbb72625c9153934629aba/40028731132.pdf
    • http://work4shop.cz/userfiles/file/genufesefusimode.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b44dfcc7913---57461176385.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e2fc98c0---18350389866.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/af6c92bfa3d177e1b57b4e88b480e528/fetex.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0f9316ab97cc6cb041e5163bcd2a2698/fikiwawakozikiza.pdf
    • https://abeess.com/userfiles/file/82392497279.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160be6d3ba873c---zigenozak.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/40rigm1kmkm1t8chc3crss8q37/kelupulomoxipegoxulemogi.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/orqdaqbi3vpep4v00pd8itakv3/liwibefepozu.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210628190918.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853daa5fa---87021694633.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=coraline+pelicula+completa+en+espa%C3%B1ol+latino+descargar+gratis
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 16792 bytes
font_01_sfnt_off00010445.bin
eebb68495058f6fc919c3e51b739da5bb1ccb8771940d4b5a9ce954cf994c879
pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 18248 bytes
font_02_sfnt_off0001331b.bin
46b480aeabb079527400090faad2aeb1af1615c9db03cc86417a402cda27af53
pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 11192 bytes
font_03_sfnt_off00014ccd.bin
35e765feb08ad626cd072b8a16b71c56fb5fe68f1806f2b0a1f12de051998993
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCD 16980 bytes