Malicious PDF — malware analysis report

Static analysis result for SHA-256 65394e19b4f0f18e…

MALICIOUS

PDF

89.5 KB Created: 2021-09-04 22:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9fe0d6dc867b068866efe67f7285f7cc SHA-1: a05cc78dd5737601c2e43d6cf263b92414245a85 SHA-256: 65394e19b4f0f18e530f7f05e40cfa28fd5dcc1894296ec24bd8a4f1826fafac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=caida+tardia+del+cordon+umbilical+pdf PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fb1omkk6mhnuhvcj6vejok1fl0/levixokewival.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/dapuzinexizoj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/psdnme1m1nbvgj7002cfou106a/79964257780.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd311f01c32---83104860299.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610febfc06a36---bodojepatinanunibobuxura.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/591f300094883dd60b65bb24b39ad67f/51295643435.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/lujij.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/geriwujufagalagup.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/98449005912.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16119a3d957d1e---baralabijik.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/52985663157.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/niwidivesivokekukot.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/dakumikabuwipivoduwire.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbae9058128---63517028723.pdfIn PDF document text
    • http://ipllaser.in/uploads/forerajaxu.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/puralexomojimawarutesoji.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/79eb6b1a1kh72ckdsapivlujf4/nekakegagekafojo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161256a999eba6---9853875032.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/jividarofibaduxejugoxa.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tuzivoj.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/kaguduresemekuruwuzalemog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7dac71b73---75210394774.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/nanatanimitadi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kchkt3d1bs7k98klb13u2vbr16/zapigerupitofiteb.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_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 10884 bytes
SHA-256: 11cf8ea0ab88ef3aa44d9a8d56c23994f49122eee1226233a6f235c221c58582
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 18692 bytes
SHA-256: d51393e98d90b5934d510e30283f7639f2b2d2bf92dc72d681b2fc3287a28e6f

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