Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18b3a285a293bdb…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 20:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3952ab22c326fef906813bea67f6b4ef SHA-1: 621fbbe51a6be4a222aceb1d902e6ae5523b1562 SHA-256: b18b3a285a293bdbaf5090837b4575fbee25819ed81d6a2f3e46330886853a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter, suggests an attempt to drive traffic to potentially malicious sites for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=best+weather+and+radar+app+for+android PDF link annotation
    • http://aftp.bg/userfiles/file/87499004984.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mosor.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/53469933815.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219443534886.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/dabisosemi.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/32712368867.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63c3d5c87---gexuvogurozi.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/438073041.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/biboz.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/foliw.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/1321805442.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dd68f724---27705879109.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/52357649641.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/39239622669.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/nudemiref.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/gaxefanizisosib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faafb1e861---kegeziwofexedokuxonet.pdfIn PDF document text
    • https://ratosatu.com/contents/files/89947106881.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/doxabumitotut.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/48057880931.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/23508841352.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/93531514618.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38150792236.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/vudakazuvupup.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/kuwutivovivolibug.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/kibapidozagi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161394554a3b18---45417184785.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_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 17280 bytes
SHA-256: 7b0f9e95480d2cbefd33361e5395ee22bc9dd9be916c7a7dc0750275ab336f6b
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 10688 bytes
SHA-256: 600af4818fb0fd72e2cd693f58d72acdefc092c4f472c2562bbedfa4431516b9

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