Malicious PDF — malware analysis report

Static analysis result for SHA-256 8608f6e871124a90…

MALICIOUS

PDF

80.0 KB Created: 2021-08-24 18:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 709679b682d4176080ebd807427ffc73 SHA-1: d7f8cc0a9745f9496cf22d8fc57ad2578db4928b SHA-256: 8608f6e871124a901722e5f672d16e3f00e077313ef6b2efa76ebcf15547ad8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. This suggests the PDF is intended to lure users to these links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161195eea2fb64---gutena.pdf In PDF document text
    • http://pushgroup.lv/userfiles/files/87677818242.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5f0a0dcefc283528ba0fa10cddb19a73/fijiwegikepa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb96d8b9cc---ditoposesowosaxelivudole.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ddb3bb7fa9bef240a9a3dd9087685252/23182907818.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160843b8312fb6---delabisusizisidigaz.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/85200386094.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/lulununikulefib.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/12d71008c96b108c3c5ba195d90e0c22/pugefomubegak.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa2e899f6f---46044268889.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/24270870584.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/losukuvijewoju.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/gubakidesugokif.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c86f6a17c36069b9ea4c1622c5b8c1e5/79476728709.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf652e4f1---4535631259.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77a94e9bd---gowagijofutirolazije.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/980d28ee172efbcc93753b7f0057cf87/18754992857.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/ruvekatewategig.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/18679454131.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/fowejesutewakuzikiw.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/10918397542.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/jukijogekonijopodinusona.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/ruvibanaxejeru.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/cce24ee329efa01b395dbb3929500474/nopodi.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/dmru1up8mamh42tr6vdpmatjrk/94215626962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=unit+2+linear+functions+homework+1+relations+and+functions+answer+keyPDF 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_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 11312 bytes
SHA-256: 2eb4b666bbee144ee967fa90777385befe9724bb33840dda35da4d0ec48b924b
font_01_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16748 bytes
SHA-256: 49781ea5bdceb77a6a96028aaf0b4c594b7d9dc07dad7f5ed52ddfe3c05a26b0
font_02_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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