Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7eafa36aa1c7979…

MALICIOUS

PDF

86.7 KB Created: 2021-08-31 15:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eba9948aca1dc813a9ef5d5653e52c7f SHA-1: f102945b81ff978cccae27abf470430e79c5556a SHA-256: f7eafa36aa1c7979a7f02ba5276ed94c5f08475ff32869a7d84519f001cefc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=maybe+he+just+likes+you+pdf PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l9b3341u8ca5jhbani0958upat/dovabo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c194ca073a2---69982967673.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/19726733867.pdfIn PDF document text
    • http://fitviewer.de/files/file/vomolubef.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/80227495000.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/80785008266.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2994642feee0bae67fbc39cf9a87fbef/ribexirumarixilo.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/61709060611.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/32703378225.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a106bcb4447---56489435113.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bce648d0---saroj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959b1cf3e8---44905419068.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/60163450636.pdfIn PDF document text
    • http://snft.ro/media/file/kisididatilupefi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/3rpugs1oe1oqv5rirr06n81rme/velosorimuxodotomesak.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae5e88324---73332310091.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/45142482625.pdfIn PDF document text
    • http://fruitvita.com/files/files/16982762759.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609316fad4721---dogoxudusikaruxojej.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/gugirerozi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/21910702296.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7745ff0b3a---gibope.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/abcddfdd7af7de29a83b2a8f3ea18948/febilubemugukodatawuwid.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/36436027121.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/duwijixuwus.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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 17596 bytes
SHA-256: b5288be0bc3dfc00b4ece1924a97d9257762c9f1c496e1d758574fec96201685
font_01_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 10960 bytes
SHA-256: 048008f9e714e5f3b81854fa2763138f26c9b25f21cf6483bda4d61a4d51dafa
font_02_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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