Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4509041c8259733…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 01:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 439d981971a44a756bc420159cae03d8 SHA-1: 311e550a1861b6b8ec200ab74c8ece26f4afa9f8 SHA-256: b4509041c82597333cd759fa6a84b832b1378d4294211deb4ca60a4daef6ecd2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm hosted on potentially compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple links suggests an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=best+data+recovery+app+for+android+without+root PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eff5962614---tixate.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/dovibovodokedajabovujawi.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kirifubu.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/69601707629.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e8d2bf3a---33430783742.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fuvalemebogu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/9000117731.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/50588686058.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/kelalifafudilekawewovaji.pdfIn PDF document text
    • http://grabnerestriche.at/75010399362.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/zigepenuwuwaposizamili.pdfIn PDF document text
    • http://generoussecurity.com/uploads/vitabijuke.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139938d21dda---bafemotag.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5be38de4eab655ab5fe2ccadd69eeab4/98183344035.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d740e0305---56814827740.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b94e69ac---88611682950.pdfIn PDF document text
    • http://koddous.com/userfiles/file/38220406704.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109160046555670.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/gasuxilepeg.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/62919081765.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/denutebemur.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/85336642641.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/18471678857.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/tovipizodikogo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a54ee1533ed5d89947747d753eee3b53/xetexokasavanubatewogaj.pdfIn PDF document text
    • 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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 11092 bytes
SHA-256: b4a164f4bc9ce5f2769f2e1c6b86dc03d8765445bd521095cd4c5fe18283cb45
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 17876 bytes
SHA-256: 04eac806117ad3fcae1efebb9f9ff5c34b52b699240747a460b33d7e0daca95b

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