Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8df389eb260f0a8…

MALICIOUS

PDF

88.6 KB Created: 2021-07-04 16:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 355818fa41001e655366f3b997d21850 SHA-1: fbdc1f8a0bad201ed5c410cc65064a97da7abcae SHA-256: b8df389eb260f0a82f55c789c84dda5c8de547162d3dd4d464ed6a68c7620e0b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or IP addresses, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e4070ad27269c98447b1f664511db79c/78306795659.pdf In PDF document text
    • http://rilta.net/userfiles/files/fobufuxizolezikexoxivo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768fc55d43c---jiwodisu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ef2543fb503b006fb988d9c8fd041629/dilerumuzixezi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb5f272977---54563052325.pdfPDF link annotation
    • https://hotnews.md/upload/userfiles/files/37472401087.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/49249593775.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/metamu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/sinoforeme.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927f3b76406---57767702534.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/fri8vvp6qre829att7g2okegf4/33549157852.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9504ea127---sotakozide.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/bevesuzugakuwatedate.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/kipevusupotajoro.pdfIn PDF document text
    • http://4bx.pl/public/file/58508404457.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/wepameposoluporope.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607df7e780800---58373679424.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16be05b29e---vevedadobas.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/zogevoxadarolujatizubo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/174f83dea7445eb1413de664924994df/gutelej.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/6ada00efb661ddc2579572b83693263b/tatasotifu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1e359a71054c7aaf299a1560ad07e2d5/97624114368.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b031c5a6---wetazemosazopedakusik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=31+day+cycle+when+do+i+ovulatePDF 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_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 10692 bytes
SHA-256: 1b15b9667032d4ed81e8c548f8cde379563097b0fb7bab5555d890897e64d7a2
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 17060 bytes
SHA-256: 2c3bd2879104f9b5e397b51b91b542338e56da3d1af2e3132c004aa96b20014e
font_02_sfnt_off00013d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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