Malicious PDF — malware analysis report

Static analysis result for SHA-256 99117900e71ed608…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 03:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43fd780a0969c9718fd457f60f28f7ee SHA-1: 6c9278f64f9b450358583f5c034494552dc29018 SHA-256: 99117900e71ed6086ffa0a877ce1907aeb96587c3958290b579c74545b3d9929
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to potentially compromised WordPress sites or disposable hosting. The PDF structure and embedded links suggest it is designed to redirect users to external, potentially malicious, content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5192

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://apteka-wratislavia.pl/halatecza/userfiles/file/98604338510.pdf In PDF document text
    • https://kompaspt1.com/contents/files/dezituwodezilidunilokusi.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/jawokusujabem.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/18872152415.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/30970463142.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/97767765126.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/6389113730.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/bojiga.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec6a6021b---79402269163.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/dc87fb426fc3d63ce7361f19c3a244a5/kotefufazisuguvusaxoril.pdfIn PDF document text
    • http://cobmedia.hu/include/vemap.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/tuziveso.pdfIn PDF document text
    • http://bienbao.net/uploads/files/mifitum.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/5499602631.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/99976736792.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6681bcb9---zopipugofakofesaben.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/bivurovinidavazisijol.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/gowuvuvi.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/netabij.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/36181479154.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/34848246948.pdfIn PDF document text
    • https://dm288.com/slicice/file/wasagopipazegezugamuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+location+service+examplePDF link annotation
    • 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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10824 bytes
SHA-256: c8ee93e6729fc05d3501ded466ad391d43d43c20cb2a66cbd16033070a1522ac
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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