Malicious PDF — malware analysis report

Static analysis result for SHA-256 808c89aaf76ab81c…

MALICIOUS

PDF

85.6 KB Created: 2021-07-05 17:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c9dc3904b764ca2f1836f6bea5fbb909 SHA-1: f7a0de8fae800c3b9953b1194e94de01ff4b3d3c SHA-256: 808c89aaf76ab81c56d09c83830586398973fddd6ec7f0d0be987ea5dd3daf84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=android+pdf+default+viewer PDF link annotation
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tpadpuaa89r2h3ctsggethred5/50991079703.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/sutosibevivudediz.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2a10caae---kisetilunexikok.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/jicpjqbdoaifm12ku4qrucaur0/zabevote.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/66259865347.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/xomatolibapor.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/88603481828.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tebakujudegag.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd695e7de---5757643042.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/1f075772afb0f2aad3857b512bfed4a6/6163374537.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27df2bbe7---jomoku.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/99148000003.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q1pg8uaudfn95hfrg56lb85uf4/rimulawodezixujajurobed.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/nugezovo.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/11502504996.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/82846901593.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/91e2185da1d7449f88476c9efad64b9f/tamivawidupugabulipo.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lunovefavasoxoxanokam.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/69070735681.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6e89018af018419e64d870e0dd7590b1/wululuwepaxoborida.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c968d4df662ac127a79bf2eeb039ba89/foduzawoxejab.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607594a10a0d8---kilagufom.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607968ed69e69---zomunawuxowikibi.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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10556 bytes
SHA-256: 48eace3fac576a43ba69ea31f41e8dd9095fa186dc33e00c337fa4c7719aac55
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 17044 bytes
SHA-256: ff90ab5f06a7ef4c778a29258954a45dd8463b3806d4d2eaa4ff04e153693626
font_02_sfnt_off00013118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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