Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4fc5cdd28d25aa…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 10:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60b18021158133287bcf3fea7dcd7a39 SHA-1: e44a7483bdc73172a441794955c7e088fd7ed2d2 SHA-256: 6e4fc5cdd28d25aa78220c01e3997d8becc660321fd45a4220e5cd597cbbb7b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of multiple links to compromised CMS upload storage further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://stepasidemedical.ie/images/uploads/file/59453513783.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/16498689599.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/684ba0bc4c7a41479957ddf27efe7c38/22543306939.pdfIn PDF document text
    • https://basisnomor.com/contents//files/ratazaxax.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccf0fbff4c---rolukulumuxekonixaliv.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/auiq25kfh2mk9o7vo60kgask6j/33323805049.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe96c1557cc---gifojebum.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/48abugldnil20lfhoilh5poufv/33293809135.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210709101540.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1629865964.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/06efbb1bc32f15328b2cf88fe17a9c1a/xefamufisagelidofomefoneg.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/47776166711.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/sajotenilono.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/114f76a59b4a816fbafa9a7324d9f88f/bugimot.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b899554e---19218550921.pdfIn PDF document text
    • http://vucert.vn/uploads/files/manepipolidivoxapotaponep.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/fd2481306913271fa0c26c85cc63ac74/57402277812.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/10904945897.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lfafc1t56s2be4ovic3m1khdu6/92866778216.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivutotuv.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/fuxatosikeluxebanug.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-08-31/29e6af0701e3d5fb874ed001f52e0386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ielts+academic+writing+practice+pdfPDF 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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 18188 bytes
SHA-256: 3571d0690cabf65079fdf7d47ffce94a912757972f2422325157fefe6ea25923
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10880 bytes
SHA-256: 390c161dfe223b653cd3a235a138969d34a693321d73c601d914fd8ee1a465a8
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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