Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4b3f4be9fbb1d3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 08:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0511ec9a13663addbe478d90059293e6 SHA-1: 443facb70754c1a56a5ac348e2a3384c19df574e SHA-256: af4b3f4be9fbb1d3c61cb1ce40abc103a45691ca2d7439576afd08b95730066f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=iphone+wifi+barcode PDF link annotation
    • http://cuacuonnhanh.vn/Images_upload/files/fogijovadanijul.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384dab51178---17000484897.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/86523420946.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/nadiwunafarawukifeferixub.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/zikikogibebifedudiloro.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367f8e192cf---fozep.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/1951541026.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/11828906086.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cd372743d71241c2fc7fe02c9739cc78/91206289218.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/42854671776.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/kenuguvuzem.pdfIn PDF document text
    • https://digireg.gr/upload/bipigovuduzifomonu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf738304f2d86f45a062793b97edee5d/lafewubok.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138411c614b6---mewiviwijetukoku.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/41324403844.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/14451064221.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/paruzegopoduvowokirabelin.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091109052973499.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xejaxudosazofamenuvefokuz.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zonedodubozetebak.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc6087e86---40278936688.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613703f16a0b0---dusodu.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_off0000b85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85C 10584 bytes
SHA-256: 4016188ba308455a4ca0edd3f0701f3364210a901d875557d052115d88b3d798
font_01_sfnt_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 16848 bytes
SHA-256: 63c906684149795478220c44e75b109ef6f0a6fcd6be78d0cd8fd5f2b1041596
font_02_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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