Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0bf59d46ec086c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 23:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d69ad4199e36af5ec01b2111303e00fa SHA-1: 5ad863b1c4e668cd0a3fc221fca655a51b0a6dda SHA-256: 0f0bf59d46ec086c156eede731a436fc5ae0f99e7c73b67c1c69107b3b43e351
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on compromised websites. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for malicious purposes. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://arch.ua/ckfinder/userfiles/files/14903870932.pdf In PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/bowolixolulusida.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/241361471a9920aef6482d992795510d/tuxozaku.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/tomixevapuvitikixumum.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/75403340839.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee3fbe1c8---pofibi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/11fiaknbsg5cu7hk5k2p4isbji/99646906057.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/vejonidirapitimuwugisaf.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3257de47---39655578638.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105b22600826---98721705642.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/loxojenekowuwow.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/rizidikaputikavulugofaju.pdfIn PDF document text
    • https://energooptima.hu/upload/File/55569664039.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/90088914691.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d19f316c61b---rudazusugupugogibiwu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/l1pugb3m03g8qpgvu44n36ve3l/19319736541.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a82290c0---busevuxirozifuz.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47413480d7---vipim.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fuv377elqq8hopklf28ousaclo/16623936146.pdfIn PDF document text
    • https://khanikango.in/file/nibikigi.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/jadegisep.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/dafuritamori.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/61215020600.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/sogifoloxugajotuzamireve.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/2814759276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=another+word+for+understandingPDF 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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 19608 bytes
SHA-256: 3fd897232ee8cbcc490005d2ccdebb2b89c398d3a35e2d64220b3f36f453dda4
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10752 bytes
SHA-256: 2300e92b85f077ed23dbe2e55dd566d4423fbd346419064933cdea42cd67ddcb

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