Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd03889cfe149e8a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-22 13:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5d3010d330a4f4fda9d9e25ae82ad770 SHA-1: 7165943e6b673a7afa849cf77dad824e917762c1 SHA-256: cd03889cfe149e8ae6ae4c3bf0d6e7e9ae01dc8499756ff149bc019c3024b952
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable, but the presence of multiple compromised CMS upload links and disposable hosting reinforces the malicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=i+want+to+grow+old+with+you+by+westlife PDF link annotation
    • http://congseng.com/uploadfile/files/71713115900.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de38cb753e---5676329625.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/liliralor.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/xerevotab.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/tegosuwofoziv.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/fimipizavajariwotezixeb.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/207309448461407973bcc73.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/zowasipuzidigiteju.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/dotafezuzizatepod.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/kapetifigudaxifuka.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e505a91---benejum.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/85817500330.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab2b33fd0---biropiwo.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xigagovatoferagizixe.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/32725706677.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/xowugepupugagono.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/buzitomigexapokedudavile.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/domerov.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161316fca65ffa---finaxu.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/gogodonuwulafabumidowim.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/62409b82bbeba0bef57b0ed8618ca4af/54040652550.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff76be80e5---ginujurujunuxiwaroti.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b696121dfb93d5dd2e2bbd44d54e96b6/sasamosodepe.pdfIn PDF document text
    • http://www.rarlaw.net/siteuploads/editorimg/file/masagaforomodisij.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_off0000b8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F9 16684 bytes
SHA-256: 89564383e2deb7bafbe203e12217dd16cf189b8f6bddf782413b7c899e26a3f7
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 11024 bytes
SHA-256: 5b1c21405580faaf016dd2615d5bf96a7d80cd5979c93764f884fcc6f194289a

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