Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf749b39322a8d6…

MALICIOUS

PDF

84.2 KB Created: 2021-07-16 04:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 71006575960b781cf9e82b54f84c01ed SHA-1: 7cd2080f6a58be0a74c53982127cccaef15f20b1 SHA-256: 3bf749b39322a8d69fd47640bc77b9e2f10dd6992247fb312a02387258ea365f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of these links indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://bselink.com/userfiles/file/36664319630.pdf In PDF document text
    • https://maconlux.ovh/userfiles/files/zakiburopapifiroledoxumi.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/26370034508.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/58605070025.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4321c8fe141c8ecd842cddbf0b74b12f/simomatekomulalokoruk.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/81428683510.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210602224947721.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974a17c4de---gufezufevaxu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/9022758075.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/a8079v9tre9gjnavbg68eqah2q/2982182950.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c7217801f---43389517071.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/22061823425.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/rumisexapukepupinixajir.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f39e3a880eb2387c129a5d731c8d7302/dukadefabojoga.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/82605663469.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ak3q2cnq4pr2d832g3064gpf90/61731763937.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/kutuxuxuralupikilisu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/36159464330.pdfIn PDF document text
    • http://dzbnf.com/upload/file///molevi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-23/20210523225902271518.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/wumerekow.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ae59fba9---goleje.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/95259664848.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/51064691644.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/nujexuto.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/0kn2abj0jc7med2mmj4ue5epkb/rajekatamogizoxawuzitapum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=broiler+chicken+per+kg+pricePDF 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_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 10372 bytes
SHA-256: 50192bd824fc79d5d7d853c75bf5a1fe37964141e9e78c206456022bdffaedd5
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B5 17732 bytes
SHA-256: f3857bd089e043d5c5af59468845e72845316095aa7a89315c39a2bd654369fe

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