Malicious PDF — malware analysis report

Static analysis result for SHA-256 051e235bcb309b46…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 03:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d090bc99535775b14e073042eb3e303 SHA-1: d1bcba4afe51d6d76fec436614abd9a276204695 SHA-256: 051e235bcb309b464db0e2cfe51cfac9acb4b552e2bd40697b18a83a04e046c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the link farm indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=working+conditions+during+the+industrial+revolution+worksheets PDF link annotation
    • http://mosjob.ru/images/file/70851510311.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/18fmvsokh16ttcat01fsnrifp5/doroxa.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c5a858c6---tagorafekarowamizali.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/65402299632.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d491e301907---4295715462.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cqrp1n65idfoi91d76pbnchoju/gogedanorubif.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/dukez.pdfIn PDF document text
    • http://sireny.net/share/files/25562058076.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/2966441147.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rotb1k8vrolptda3htou66i7g3/sidufilujixupotufulapuna.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/57088983149.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d74c2f806c5---91572616588.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c9dd996a4b0371f74555c5b61de50708/14681510093.pdfIn PDF document text
    • http://1carl.com/userfiles/file/vebazusenamuxe.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/lipepenofilonisowuviwir.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/50495839194.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9d4b4355649217bd2353467ddd7aaa8a/safovono.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719606c02e4---nurokesunilo.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/24386052589.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/09dfc24913e163138c0145015063d547/57148387480.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118201e9a219---93972712759.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/82122773933.pdfIn PDF document text
    • https://fishuntpesca.it/file/vebenejepodir.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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 17324 bytes
SHA-256: 4ceb70604dcd82ad9aff75e071ee7a7cc5df6869684e7e1a46980d8e1459b9b7
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10988 bytes
SHA-256: 642e9f417dc125bb37c169a23d4a7d9dea564027e8ca539996ff08d26d8c50e2

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