Malicious PDF — malware analysis report

Static analysis result for SHA-256 97132bde5aa37e1e…

MALICIOUS

PDF

88.6 KB Created: 2021-07-27 15:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f9f840b361c6b83aa819a6b856a51f6 SHA-1: 95b55213d41dae8db6046e583e9ffa3e84721a84 SHA-256: 97132bde5aa37e1e664b56cab8ae48823a7c2b53216f9b9af900583ad11d4afd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1deec218---volanufenixarefuju.pdf In PDF document text
    • https://anfauglir.com/images/file/30324062257.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16083500e300a5---11960140120.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/47073636160.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719af246f25---polesadukibajoxokamixofoz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08809d29d6---47926098422.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6ndbl9j8ggjbvaoirasaqn36j9/vabip.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/zezipekosamawonadowifa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fbc6f1fae1d7bd6ed67f2d0085a3e65/bunufibisopuwimexesoweke.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/56212194684.pdfIn PDF document text
    • http://splogservice.ru/content/file/zosikefus.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d92580db8---wopumebab.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/344uclh8dcstisqiuhteq26g5s/89848107302.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/jejoralunus.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7753b4bf6b34fc99fe28f3b98547b1ba/58901241007.pdfIn PDF document text
    • https://buka.ru/sadm_files/pukesilogekevogabasudal.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfd2db1268---gumojo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/getomafatoxevedew.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/depegikopulasumafokiviv.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/79d2ddb54c07750b88738abba187b374/60027560175.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zawiwowovonuwiz.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d374c6b18361cee00a59bb7c5d217e65/madis.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/33073993074.pdfIn PDF document text
    • https://luminex.pl/upload/file/wirewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+sign+into+netflix+on+xbox+onePDF 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_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 17720 bytes
SHA-256: 25616177b342ec37211e6f3fe773fbcac14ce3b1d15f9c9e81e069200c375a5b
font_01_sfnt_off00012419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 10444 bytes
SHA-256: dc6d700e05782486815fc772abcb3812f82ac908a20bd92636439eb374d52864
font_02_sfnt_off00013bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1