Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f64b97072b96f56…

MALICIOUS

PDF

80.7 KB Created: 2021-10-05 18:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d2b1f23f434cf3a6e35c5a6bf9a2ed80 SHA-1: 8e2cc0c4ce7c9f28f0394a6263acdd30e1f1ea45 SHA-256: 8f64b97072b96f561f4f9204b9b70e948096ab4e40d3817abdea2f2bfc19fc57
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://csc025.com/userfiles/file/20210925042543_hj69gz.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e704a300244631164d739b955580866d/76405284077.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/wurudubekekufuw.pdfIn PDF document text
    • http://benrassam.com/uploads/files/dalete.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/98916829526.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/puwuvajamabed.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zevefoginimopobisop.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613566310a593---27300056648.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/lopusadisaminoworigefe.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/99217979396.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f81197a77b---51698206126.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/86456122794.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2e2efb75---66921721063.pdfIn PDF document text
    • https://proxus.nl/file/vezajazutexariki.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/84tof70ufa99vb5d4vt398bl2k/jusodekoge.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/96907906548.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8ec975ac6---23357738544.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/47054056145.pdfIn PDF document text
    • https://fong-cai.com/upload/files/fexakeremodemitixekesi.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/dejasu.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/pajefezidiripe.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rnukui0m2oa1142podmjah1734/32894112318.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/92919905379.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/12969913000.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/sosoperev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cute+have+a+good+day+imagesPDF 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_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 16332 bytes
SHA-256: 50681ec2d1aba672b8148cd12c44145103de63bd3e2ebe961be8fe9b0c8b80fa
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 10756 bytes
SHA-256: b4e24da263096ae77226cc00f76e937141ee50e52ba4aad7c915b3f52bd8058e

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