Malicious PDF — malware analysis report

Static analysis result for SHA-256 1905e058e28931dc…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 00:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e24fcda33a4800980624e7635578e4b SHA-1: 408f003ec9c45fe639e41ea5c3f7fa4072acbec8 SHA-256: 1905e058e28931dc8eb496cdcff0fc65483aff2f71e8ece190647d6972d305ef
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 5

  • 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
  • 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=usb+debugging+in+mi PDF link annotation
    • http://popnmusic.fr/userfiles/file/18261495641.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/towakeku.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910085504716.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/rivosilovojelafusuluduj.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/71191190735.pdfIn PDF document text
    • https://jensbrode.de/files/file/20196994134.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210904_27A2716304D513F3.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/85883235580.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130823a47753---13162624.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fizibelofemo.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/depipijoku.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/budenamumoze.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/texamegazupenunaterisufon.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2987574956ac604400caa08f9ea4c56d/wunutezamofedex.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/jomeziti.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/dexizije.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/97647034541.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/3542953108.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e72d155f6c---mezasenunedujovesore.pdfIn PDF document text
    • http://chenruichem.com/upload/files/35264542913.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/16e7f42e11456945049c9720626291e2/11734476756.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/29733404421.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109101112072427.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/85169727313.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 17384 bytes
SHA-256: 67b5e5797c87df3f7f55f18b418f5989720ee1fbeed6b5376e7dfeb20eea9b3e

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