Malicious PDF — malware analysis report

Static analysis result for SHA-256 b311ccb2bd1a7ee7…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 03:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc1b20535dac04b395530c7e9e358723 SHA-1: 118f25cab65a2b683b7fb2ad9cd560cb59a135b0 SHA-256: b311ccb2bd1a7ee744821fa0dffacabbde77174b3d03f94f779270a7063e24b8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, which in turn host other PDFs. This pattern is indicative of a phishing or malware distribution campaign. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests the PDF itself is a lure to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/28110769e59228f4544788de5c5924a0/22778022392.pdf In PDF document text
    • https://nestsearch.in/admin/uploads/file/21930429011.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160edc2b4b632a---dezunudevax.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/15126893328.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/13d1e8e03760f7545f5a15e1ef6ef093/57373576159.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5bb4655b340c3b4a1a36ed50d3d3ad9/44582571976.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/50927627675.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/3797226570.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/40235527771.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090955455e57---34227084549.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3204bdc21---8489921774.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7be4ec13f---40038691841.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c83d0b64f31a80372b9f241323ba1f03/54109249526.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f78083b0---69192646956.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/mekodugedagis.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/74f18f17856ab2dc98dd1f1e590f3296/6819423781.pdfIn PDF document text
    • http://atiksigorta.com/files/39449573689.pdfIn PDF document text
    • http://proxima-design.cz/files/file/mobafefaxuzebipulibi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5kdv6fd5ssg3mh1n3ni68clu1o/52720817818.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960cf54cbdd---12569007610.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070155ce69fb---32770206076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=3+day+notice+to+perform+covenant+or+quit+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_off0000b304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 16328 bytes
SHA-256: 84aa62e88d7cd52e4edeeb4fdc852d6b2a8a09c46ca3c0a355419a588329628a
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 11068 bytes
SHA-256: ffcdee7336a1da7ec6a93416e04c9b9ef80db4e4b3a6f8eb5252d697fef8e92c

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