Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4d025a4526ad4a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 08:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eef8a36e4e575365496387bb194ca2da SHA-1: 907bf0b2e971bb9d0819b833c703e6a0c7bcb094 SHA-256: 8c4d025a4526ad4ac681312adb54faa7b6600d6be7181705d1e5e9c0ec177191
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=convertir+pdf+a+jpg+gratis+online PDF link annotation
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2qqcp4llloevclrcjui0lhs4t2/31234472134.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/8580313873.pdfIn PDF document text
    • http://blueyee.com/upload/file/07123052447.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/kifotuxeruru.pdfIn PDF document text
    • http://atek-ent.com/upload/file/75329395483.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/13/files/46349202741.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/monijenurepozidadazupomur.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/53670937924.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/38331782755.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/95dd2ff0788de253d7f2d04b06abc284/lovero.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b028f82735---tibaxelolaxerabevozep.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/lutazodilaxexejufuwirapes.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c28db46ed973145f87eb8441964d589c/81778475940.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/gijitojikimumexod.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/52479777783.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/venufuboninifej.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/14757009307.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db016ce5990---79635435986.pdfIn PDF document text
    • http://groupkaishan.com/d/files/lewagifalabogovorerikizu.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/35260099518.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9e8da6b1---robosalamizosubi.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/27402840772.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximetaj.pdfIn PDF document text
    • 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_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 17680 bytes
SHA-256: b3c18f95ef88b5f72b3d8a936c0e431f24eab09898be791217d3ff8a90077818
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10900 bytes
SHA-256: 2b407435f17bcd7f0e16c2327dc8f7194125429a3c4cb76f868df5d956669d45
font_02_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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