Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1e1127c3aa61d9…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 07:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ce55ad8f2dd64cf9c7e44dffe3db225a SHA-1: 57aa4b601bfed33f2b4001e5884eebfcd8454a7e SHA-256: cc1e1127c3aa61d939208bae834b2ddfe10fb4a9d1b5dab146f33845eebcf338
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and a link farm structure strongly suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://auto-rujo.com/images-editor/file/85404260692.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/zawetosiziriduvuj.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e0f3ec44f86d2d0ba6e7397523aa1e5b/ximitat.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0a254a59504c2077f2b03bed966bb12a/wiruzidizif.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/23996317685.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac21cb7998---70334290711.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607439845dfd5---65302853159.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79727fec7---14567052075.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8c872586af5547bdbbcb0ca0e8638715/78561414220.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0e67c073---nuxifi.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/tovar.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/gepawurarev.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea586e4733---83306110303.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bovorebaviridosiparad.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/sedaxodowevoxi.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/cdb72ceb8c74430b62ce251ac6b08e7b/foxegimuvanowomogixapi.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/95350325307.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7c7c1974---59563751141.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/98655841994.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/64340203333.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9404c8b6f2f301cefdbf550f44cbd4c6/peronasuxefegorigulaledos.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd033e5be---bubaj.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/kenulutedowetunotunu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/xofode.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe42afa29---66396027227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=html+to+pdf+converter+online+toolPDF 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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 10508 bytes
SHA-256: 3dd3020fc2eb7e4c711550a30177d64a8ec02516b87dc4d81d006c6b172f2020
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16284 bytes
SHA-256: e1d29ba5fa0405c7bba9e5b50f3e6a7e2a6eb4987512b0060690f94e800bcb3f
font_02_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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