Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c64aff2b02fd555…

MALICIOUS

PDF

94.6 KB Created: 2021-08-09 12:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6d0d13ce47e69d55bfbf10ffd17a4e4 SHA-1: 7cddc6dd533ccdff5bb98b677a70724bc7bbccc0 SHA-256: 6c64aff2b02fd55552fddfb47d8bb713ab3ecd532799826a1e1cb01db803c675
156 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. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external URI heuristics further support its role as a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7c48b679f---7229091893.pdf In PDF document text
    • http://firegallery.ru/img/upload/73735480605.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/65dc2c9cdd0afade4e4c658a50b16c83/gimogoxeromutufavuso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a8e94275---97189847461.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/kusoxitofodokilulebuwen.pdfIn PDF document text
    • https://majubesar.info/contents//files/fosekuwanikekeketaju.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/pdne08pdnhu1k4eia8q5oeaft3/80515075681.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160863bdf5d0e3---84006479135.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gutefonemubikukukizawega.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/47666471957.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b485db7698c---jemubixorujoka.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/77766889820.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/98708359365.pdfIn PDF document text
    • http://aimic.com/userfiles/file/32870210593.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be626ed7f---82129234605.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2353a3128a8f55a643640e96b38d2f68/25730511338.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/70108146182.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6af9e26fff938978b5f778d5f16020e8/mixab.pdfIn PDF document text
    • https://people11people.gr/uploads/File/rafulirovi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1986cd2fe72a2687f289f9be22de98a1/39802487149.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2ecc9aeaa74821f776cbb816825b6846/bumuwaxizazaja.pdfIn PDF document text
    • https://atl-50.com/files/file/molapepikurugajebupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=european+pharmacopoeia+9+pdf+free+downloadPDF 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_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 18032 bytes
SHA-256: d0cefc21ed24760b5282200030f6ace03ddc89798962911e9c4a4d3cf3d7e08e
font_01_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 10956 bytes
SHA-256: 2f6741c1697c5f2207c111d68eb714686578d233d81c92d4adb035feee83ed6d

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