Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d34f7286deae1b…

MALICIOUS

PDF

80.1 KB Created: 2021-08-23 16:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 263e01b99b6d0797f100d41506925300 SHA-1: 526f6b790976947f5ef10f92c3db2fa3238bd2ad SHA-256: 93d34f7286deae1bbefd4a7fae7af4bf87661ebdc094d73eef05ce8b2f1c1209
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb68fb9305---lojagetofufojawexesu.pdf In PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/93858995593.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/fagudoxalavinatixog.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/53422955680.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/56161723066.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/11508586311.pdfIn PDF document text
    • http://www.toptehnik.si/images/70661727413.pdfIn PDF document text
    • http://change4best.ru/upload/file/28731890988.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1043367499609c7e401ee02.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/gakexokadevarovukedubu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160869d84752d2---xuxin.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161215cdfc9d8f---bugokepum.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/xunimi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610001b6dfc22---vowafogusolizibame.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/fotujezikobeg.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v2cc5tjuaem4gsamd9k3t110e1/50691351169.pdfIn PDF document text
    • http://unsersohn.ch/images/file/fujivepenumusawaxajil.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16105fbbc2b58f---lunovutofu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/kadesofa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd5b8e2fb---24729906544.pdfIn PDF document text
    • https://akvaguru.hu/user/file/sesofajasa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/53642664590.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/nokufetiliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=inside+out+resource+pack+pdfPDF 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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 10708 bytes
SHA-256: 1a44622e6bad68648ec1630f0cdfd026c607aca417537bbbf244cbae3b3851af
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 16092 bytes
SHA-256: bbedaf4e725dce437fa3dfc794bbe79438c8b4f3c9cdc01175ca37646529c787

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