Malicious PDF — malware analysis report

Static analysis result for SHA-256 59255c632e82e02e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 21:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d26a44fa3484e1f07a7c9a6cdaa10a8d SHA-1: 91ed2ab65c38c88d7d3f446534d47bb73154e1b2 SHA-256: 59255c632e82e02e9e494e6934dd82dc59be5c4db1dc2396b9ea893fab0a23d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of a link farm on disposable hosting and links pointing to compromised CMS uploads suggests an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://onsale.social-push.cc/data/fckeditor/files/xasisimokiwakozimoza.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/68605974780.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613268acbb431---nibakosagurapu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15ca2c46b---tulilukupulojawip.pdfIn PDF document text
    • http://benly-carson.com/product/files/21390719847.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/xesezutep.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/dutoxoxonubaxemope.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/xumobigojoxoderaxudoref.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/tevilupesuresisijisi.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/11015847161.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/nigoxawigazefarexososogi.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/40854192119.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/23063142599.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/87692019283.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/29129196815.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/kifexolakejosuxusexareta.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/38449019224.pdfIn PDF document text
    • http://orlickachata.cz/files/files/xonurimovalulotu.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/s1tte0ksnrf8qpp4c3v6s74621/632562769.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/36466485737.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/taligeledekevowul.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/futefewuvuzupex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tenet+francais+streamingPDF 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_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 10476 bytes
SHA-256: b8e76a956e11821c10850c78bd80b637e97297558a4cc64e8ca85d541437d50b
font_01_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 19336 bytes
SHA-256: dc451e5172a024324b05ae1163f996ec8037161bfc182be59c1d10dc485f3301