Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa37d8c4a58de69d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 07:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd81711913f44d54127bd3987eaec88d SHA-1: 52bd7d83746c44a147b70887ba0c92c392ac420b SHA-256: fa37d8c4a58de69d69f78a3873c75440a085d9521358646596b6afd23b69510a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to various domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=ludo+king+mod+apk+online+play PDF link annotation
    • http://fukaofoods.tw/uploads/files/202109030007212835.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/54142720071.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/54722540301.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/zuvoluzidofodakokal.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xokedexatukogalubigav.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tefokazi.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091805112629776.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/71487036817.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/risabajul.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ed3c4eaa95930e935ce672df0baec0f1/vekiludasum.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/badod.pdfIn PDF document text
    • http://rinsacars.com/files/others/16718764422.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/37279383359.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58ded57f9---78489665303.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/tasosizolo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161424d9758238---32814383430.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///33222911807.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/19329811241.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/89205908670.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/2917719694.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/3048250456.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/jizumapawinopoteradurig.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/sodejuwijewuruvivod.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/25064609291.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_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 18032 bytes
SHA-256: f84a1441d8d3394dc0b0b88fcaf23d6020fd0a9bc798b35ddf80476e7a81bead
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10632 bytes
SHA-256: 179c8c8d77abd02ffa38275eca884362158501ecf23e79f827a98a066cd15e78
font_02_sfnt_off00011bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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