Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55022e3ae1bbbd2…

MALICIOUS

PDF

97.4 KB Created: 2021-07-12 17:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06df4cc69f4b677e30a10acf09cf846c SHA-1: 37fb83e31d2a977ede8e7e7c78c423904c1e67ef SHA-256: a55022e3ae1bbbd22d872392ba5e9d608c7e9928d8ebe68798493243b930f25b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, suggesting it functions as a link farm to distribute malicious content. The presence of 'utm_term' in one URL indicates a potential SEO-based lure to attract victims searching for specific terms. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=thinner+leaner+stronger+pdf+free+download PDF link annotation
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7dd03f86---17645062672.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b63c8086f---62766907880.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c6a85ad6e---sofologitifavunovuzuvepo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c3d4ca9e9b294ba9e290ef99bee9e708/67899128827.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/30d7c7ef43e4307a6cae56b96b9176a3/35428559470.pdfIn PDF document text
    • http://getem.pl/files/file/56974024892.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/97215933639.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6jf99eov9egg678miq8n8n9k5j/puluturimexinojifuma.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ccd87faff93e69a9e91f1899df92b261/molireperi.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/bimarisudotivuxedi.pdfIn PDF document text
    • http://esistore.be/userfiles/file/xedekekasojosiwe.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3615fe65---zapowamamezujok.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/363789349.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0b8ff2c77ae982a08025d8336d003122/sutubosiz.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d4688d35---bapewimubupuwuv.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/29297655164.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/13a16dbbe32d9b7469efc4f95b3f0538/panemugejidasape.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607471ade755d---jutemarevedad.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b49815e---kamokazilokedeguf.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a13ef6197a---wegikokexitogurivafov.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/34869557677.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/32056982120.pdfIn PDF document text
    • http://panteres.com/files/files/benomupipogiwepep.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/62576406889.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b89f16d8---37720942651.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13ed835ca---welekase.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 10828 bytes
SHA-256: 5ced0d9ee9a57ffaa29a677f646dd82460cd9ec057710df0913a03283b913a5c
font_01_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FB 17956 bytes
SHA-256: 42f319bb5d0b1f2ea9e52a88698fa2b64edca442d8e7c361190ca83713082f8a

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