Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dcc5dbfcea40f9…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 03:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cac191e0f66bc630ee13175c80ba7ff2 SHA-1: 3331fd3a00d7beb0de38baed26e22361ee4e1d14 SHA-256: 55dcc5dbfcea40f936fc9bf0658e1ed91710f60d7e1529ef10e10bc89e86b14f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://philabc.ru/uplcv?utm_term=fluffy+and+snoop PDF link annotation
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6df535594---koruwimikeliz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c256d5564a4a09a9a7488b1cfb714e7a/zurepuvuzoxoxemevu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/327a8a71b86615d2c49082e0bc3a5679/26887581253.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/91719615419.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/91144781708.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/88db9750d0c65ee59831070fe16abe12/fovubinufafogatiji.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d608bac4---mezogimekaw.pdfIn PDF document text
    • http://arslanemlak.com/E/file/51907143693.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609671641308e---pesedorukatawarororekeke.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/75812342834.pdfIn PDF document text
    • http://lucann.com/Upload/file/xogalodusevasagosupuniva.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/6301038795.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/wolazuwakoxu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87809361931.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gi1hqhrgimefva1mjg3p8t77it/62106364144.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/60558567298.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b3a6b0c1d38f29360d25e33a43e725d8/sibelagibikojorej.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/dalib.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/39480158613.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/26ed4c35136e6e4fd6b258f21e7b9ebe/nevawelukujonovimemedumo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607125b733d16---18694031764.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/n1bvkm3aubikoq8798ei9ccor1/juzofoxameludewivitekenat.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2cc256ed---bokiwepo.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/13355896243.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 17824 bytes
SHA-256: 4855af6c8a63a1c05c3d2a86f2bbb43409c2342523777c078252de60d938cda5
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 10260 bytes
SHA-256: dae8774c4aadd51f62cb44b41223cccba55fa33ebd7c5c527972ae6123974e27
font_03_sfnt_off00013bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF5 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee

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