Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85cab9c5989f010…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 20:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 315a8899d3f1db292af890b1b4084cf6 SHA-1: 233a19eafc2964c76480f5e5d4ed3cc0a43059fd SHA-256: b85cab9c5989f010e2bccf3b1b6dce26aecc2a6d59eb7906f2eb442fb3cd3051
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate that the PDF acts as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. This suggests the primary purpose is to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161582b1c0bdfa---56550114608.pdf In PDF document text
    • http://csc0731.com/userfiles/file/20210913122708_68h8ww.pdfIn PDF document text
    • https://educhina.mn/editor/files/mibifugob.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/pusulozazivujovukujep.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/mudetufolamogu.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/jemofi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16750632b---55375535775.pdfIn PDF document text
    • http://entrackintl.com/uploads/sibexogarakidup.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/18796131776.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc05ae13a---79403039802.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210919_163126.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/15259019295.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/bijekimokezad.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/jedefumopi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/nedib.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/nijoterawolojemofusozugu.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210912072304_1407837801.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8dec1c1341ab7ea7aa713d6935db34c/75709662041.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/77892463821.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/54506153361.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/54835038264.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/8877934881.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/82542034321.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/55950132489.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/93947201517.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/warafaduwejag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=difference+between+note+and+mortgagePDF 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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 10832 bytes
SHA-256: 2ec182d434008f16ff3f9ed26ac512759f2158fd6c3891dec26279bf7394e5da
font_01_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 15540 bytes
SHA-256: adb7de4dc0d4fec040b64f86cbbe2773d9ad1b3ed94e4b8f802f4b7bbb9be400
font_02_sfnt_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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