Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1cf713e1f421fc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 11:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24d8d5c89f32b3ecd75cad20a185f5fc SHA-1: d85b7c03c92be3ae1604e4ca4e6adc5d351efd3d SHA-256: 0b1cf713e1f421fcb4bd433cc502dc64cb83e0c71372224c2cae7ef723099e48
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 document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ovalpolycoats.com/media/pivenasutex.pdf In PDF document text
    • https://bestrecycledautoparts.net/images_i/file/98029588976.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mot7s5vucukv60v2fi2hcj02ub/puworelolifuf.pdfIn PDF document text
    • https://ubranni.com/uploader/files/gikikekunefozokomurenok.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/kewunitaxejuva.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8ec3dfd182b914d512cf694c2befc5ad/suxuradojobotuxomatekun.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/f39b5538d146110708084575087ccaef/gijuxosuzuwawafozin.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6lc46i2kflgpto7sdt1aqeir6v/vetobubokagub.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ae18bf50a44c91df2869bbb7438977ea/75647714605.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wepumabunukofubaxa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/19354259270.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/16753675794.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/41172187567.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1245fc070555c373534aa72a16479efd/bifiwekesesepeneruvurex.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2fa00924373804fa1ca4b0e65368f3e3/juganikufasidiniwaj.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/79789556182.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/37360198489.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/9480695849.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/27646916574.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e47a0d583fd---bovutezoranevogamuveren.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/fopadakumo.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061419541870554.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/gejinebovorotivevatez.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/12768559886.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160945705aa8a8---lesevaviwiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cnc+lathe+g+and+m+codes+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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 10904 bytes
SHA-256: 8c70b12f5ac45fe95a716f27e0418a8bd6c8fe4a6bd4e2689cf0c804db301c1e
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 17488 bytes
SHA-256: 70eaf8cd2642865570fd065bc62ed5ce4abfb90d95128ba2653a47147942c284
font_02_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1