Malicious PDF — malware analysis report

Static analysis result for SHA-256 3116e893d6ac4b70…

MALICIOUS

PDF

82.0 KB Created: 2021-08-16 01:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b272f5954efe3b11acb99963d9899ac5 SHA-1: cb9b655d2c0e7bcc4706d86d4a5b74523293b2a9 SHA-256: 3116e893d6ac4b707ece77dc963ff5ee16618f2ac7cd33b80e493a60536edadc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/802sktq932hrhdqk3tmu23chi5/dabofil.pdf In PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nenifatasefaxodixeko.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/burajoxole.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nijagukeditovokakuk.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/efn86oarvgc0n3enl6kkotghhn/47203334188.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/58318168561.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/duloj.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/69260594318.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c840da3a14---walezuzebajamezib.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/pajaj.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/41782475932.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/15634694877.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9a37ffcf43130a555b6d86dfd9e21f4e/47250117997.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/lefasejovupofotax.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca55418feb5---bewezivabaropiwulo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/poxerinoxaw.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021725141368645.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/68889878865.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dikotutogeludifis.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9138521a492f98a000cc3a2e337e5216/21894482393.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210808_DD6CE1BF0E63AD5F.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/15/file/20210715_164615_167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=subway+surfers+para+hilesi+apk+indirPDF 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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 10984 bytes
SHA-256: 2b39d360670c4f0f83fb1b32d6d5f5e6dc3927ebe4db1c13c88807706fb52d4c
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 18964 bytes
SHA-256: 5fe04156fe6c9170e4afb6fb2a564a9bb59d685f424e2f737fa64bcd07fe17a3
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1