Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda6baf48f8788f6…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 22:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 876329c83ed6745cf6ce90c6db725091 SHA-1: f3a6a831951f9cc5995c96dc2766a0cf645f0258 SHA-256: dda6baf48f8788f6a886c05fa1f46ce372cb4819628fed19d1aa6d540df9d081
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. These sites likely host further malicious content or phishing pages, aiming to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=disney+hercules+123movies PDF link annotation
    • https://mikc.kauzi.org/uploads/File/buxapivexavisaxoxafivopuw.pdfIn PDF document text
    • http://didopack.com/files/maxuvixoxex.pdfIn PDF document text
    • https://susta.vn/userfiles/file/87115181073.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c941e4ee5b3870c74188303fdea8045b/50232203484.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/68921974475.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/gipikujusivi.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/94056629160.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/laguw.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sinuzodesag.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210913_0CD028F61D5151AB.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1d3020daaf0e75ed89534192360dff70/33841714505.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/ropex.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161384b0bd1e5f---kuzikefatutaga.pdfIn PDF document text
    • https://slavyansk.biz/userfiles/file/wubunenaja.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/76348893726.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/gagiduxosej.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/5760624940.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/17268974969.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/13213782939.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cfa1114fd334fad814b5d164870ca8b9/14992047797.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d162e3b5d6---30342106065.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/sorisawudipagijuji.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fuwasemeparamoxowagukaso.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/lusozudikakitedun.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_off0000b1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AC 15160 bytes
SHA-256: b031b931c0709a81a463b2f55e58adeee6f959814197c1fab9df6160efb5cf3e
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 10860 bytes
SHA-256: 463b57912d7308cdc3e8e673d5f0d66d7bdfbcf9cea76cd5577a4eeab55556f5
font_02_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1