Malicious PDF — malware analysis report

Static analysis result for SHA-256 399b93ad0bee9abc…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 08:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5eb92bbd64abfff9e2ab9821a4c701d SHA-1: ae152477d992f1fe14b98f35a79fee802f72c05a SHA-256: 399b93ad0bee9abc643e4aa0191eaa44087862a04ca6efb7d1e8baa9bcf4bc01
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 external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.singaporemedicalclinic.com/ckfinder/userfiles/files/rawakuwakatomi.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095445e494a6---22901355384.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/91094064604.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/72798003240.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/dakogipu.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/45600020946.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/39093053735.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c8526af9f78e93b02ccb96b463a260aa/dutovanesuser.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/52638243037.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/629cbb83ca5d64ce9e70fb0b1e883efa/gisafaxowuwovosetaduba.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8b4b8c78d---xopoxizugo.pdfIn PDF document text
    • http://sakra.sk/storage/file/333977119.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/wonirapugunaforu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/78332109314.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/22957544548.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/53808892415.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/979797f1d759ce2707f92eaffaea324f/83219882588.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/rozivuvivijisim.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/dinuwopisekezawuvalig.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021521043291065.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nhc3pg7iq9t07pcglmhjcts054/mepivodariwizawopun.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516183706.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/20090389102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=measure+of+central+tendency+formula+pdfPDF 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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 10896 bytes
SHA-256: 8e54d9a64c9ee0d1272e6290ae2c9d766c05bd4ca787668c4952cc83386023c7
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 19940 bytes
SHA-256: bd4cbd0ab04d13d8f355de3da9902c92a314dfe0fdb4b6342b1af40834b6d39e

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