Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7c8766835912e5…

MALICIOUS

PDF

90.3 KB Created: 2021-08-18 07:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d4a09c20582300d67a10dab714d0ee9 SHA-1: d94bf6c660a31aa4d7bece4420a4aaa968d3e6b1 SHA-256: fe7c8766835912e5e9e3b1fe6e899ee8b6ab988e217e67de0a6edbaff6b02929
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload directories. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/1db40952c5475b58a53ba19f24396bdb/xinumavafazapowudapas.pdf In PDF document text
    • https://cncunse.com/d/files/nonidemugabobux.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lanufigejenoveja.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/59361650251.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f108948d40---86483275941.pdfIn PDF document text
    • http://evola.it/userfiles/files/kigibivoxibarit.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/23400067ed2f31de1af72274a8e613e3/dafunazigu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/e2jf2drlsh427fkksof9bvnju2/ponulefiduzelen.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ng16c5gvtvru4vfmskgsdsl892/rugotagafa.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/nonininikimikelijupovobo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fukifabagodoxebonamiz.pdfIn PDF document text
    • http://wirheiraten.de/images/file/13599254336.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/pafebasufufudaf.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/46397134382.pdfIn PDF document text
    • https://digireg.com/upload/72021391409.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/dea95bc703dbc4eaed8a1b16bea5c141/wevubepopukotugamenuvo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de1bbd73f50---68784522637.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9095650476.pdfIn PDF document text
    • http://thaide.org/userfiles/file/19525676482.pdfIn PDF document text
    • http://ciskmv.com/css/file/mofadigi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kerepodub.pdfIn PDF document text
    • http://industrialdevices.in/uploads/70898842359.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/20575201684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+a+venn+diagram+in+google+sheetsPDF 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_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 10928 bytes
SHA-256: a819102e52ae11b6df2fc1416a12a2f06bd90af3f1d009d0fc0892acd6236096
font_02_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 17688 bytes
SHA-256: c08bd34f48dc4b253c17926c003d705176f223a2573de9e9d18c2134901d1d77

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