Malicious PDF — malware analysis report

Static analysis result for SHA-256 3998a9eb865d10b9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 05:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8735fd852f7c31248de59b3c9d082653 SHA-1: 9672dffb4e2e1bd7916b279f7edb13226b1e253d SHA-256: 3998a9eb865d10b9c0586f82b616a9d81a0dd48a9f284522bb8e803af90e8d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=smart+share+lg+tv+mac PDF link annotation
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nusatiwowunipadodifonuduz.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/91009864632.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/fulixuv.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/35731645476.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/2653899301.pdfIn PDF document text
    • http://xn--c1ajalgzu0a.xn--p1ai/userfiles/file/baviwesupemifosawupolak.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/novilutavifekepe.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///xodadoravonokozikizivi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/vefukuguzideviliwiwete.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/bo5pnbj7bvccdgv2an7p88pud2/jojojix.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/ganul.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/wowuxoremivezovizajaba.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/55304396011.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/77130838019.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/50328027864.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/11067059415.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908085501.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/74740078562.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/34l7h9n0mquj5l09j6vjc8tot3/74591776622.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/flq688pralpsc248va22tnc5m2/55659749350.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/mejuwabigo.pdfIn PDF document text
    • http://z500.si/files/28901723554.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2ce45ded---nawelapopadejowofazos.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/38784326039.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/kizaroladebifojaxajabapun.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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 17460 bytes
SHA-256: 5c9c76b88b341ef08e188fcd67dcbf916cb384230c4fb9d1bbb8e9a0754be438
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 10504 bytes
SHA-256: d04562049e18552ace6ff8df10a1269c0c409beaff9fde93e97bbc99bd6f3ed9

Open this report in the interactive analyzer, or submit your own file for analysis.