Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd2d8bbf8963177…

MALICIOUS

PDF

89.6 KB Created: 2021-09-23 11:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 295b6ca87b6442bf8dcb8d22254237ed SHA-1: 2f988ad5660897cd46421f851df1cef06e8eeeca SHA-256: bcd2d8bbf89631771f4604237558c43bced839fe202eae47899ec6723c41ad84
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=after+life+movie+watch+online
    • http://thekitchendesignstudio.org/uploads/files/dediz.pdf
    • https://kisikana.hr/UserFiles/files/rufev.pdf
    • http://sun-dr.com/uploads/files/202109111732532027.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/39291749689.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3697aa6f---77282549084.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c513e795c3098d6e87898d8a0b207863/toxuvisovujavovitusini.pdf
    • http://digilit.ir/basefile/digilitir/files/tugixifegirewidusitix.pdf
    • http://lovelyspa.net/ckfinder/userfiles/files/29628296873.pdf
    • http://toshiteriyakiburien.com/uploads/files/rogebakakug.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/24180714295.pdf
    • http://formpart.com/upload/ckfinder/files/kidudu.pdf
    • http://www.pranabkumar.com/fckimages/file/90608360030.pdf
    • http://boston.pl/fck_pliki/file/xaxol.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/67714240482.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146b4bb38977---92860626859.pdf
    • http://alles-vom-schreiner.de/userfiles/file/38620965021.pdf
    • http://improntediteatro.it/userfiles/files/fuvipupemasasagosalax.pdf
    • https://wemservice.com/ckfinder/userfiles/files/54148005262.pdf
    • https://hw-power.com/uploads/ckfiles/files/613ad4892ece8.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/xiroratiwudevawabada.pdf
    • https://rabudiagnostic.com/userfiles/files/sisexesa.pdf
    • http://4998horo.gmmwireless.com/contents/files/supaxoxe.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210912124637.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131a54996d0f---78386086574.pdf
    • https://hijaustabilo.com/contents/files/jujupasijelulo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb27.bin
22bf3d9077892c7510a73435dbbb11a692114c5549e76873d5e4d66e0683033b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 17724 bytes
font_01_sfnt_off00012891.bin
228e0169ba8d4d7985363cf2a58d1de6d7c2445878eb8a651d1db292aeda0231
pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 10564 bytes
font_02_sfnt_off00014085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14085 16792 bytes