Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8806543107cd0fb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 01:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd120bd45fcda958ae4b3d787741fda0 SHA-1: 8b62ea66e4ea256e4001164541214d7dca060f57 SHA-256: b8806543107cd0fb46c91f53ab651962267a709b48fa8481ec8ed6db6b4afc3b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=ludo+master+app+apk+download PDF link annotation
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/xanekilonozijilat.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/96980256924.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5jvm39khvq9glidldkv0rle2cm/41556551750.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/7550581431.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/42338125502.pdfIn PDF document text
    • http://xprchemical.com/upload/files/girogativotazin.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/telanisibuzogasi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161401b2e9ed1f---68443212915.pdfIn PDF document text
    • http://mweb.cz/images/file/bebonamegibogefodit.pdfIn PDF document text
    • https://korankertas.com/contents/files/tuvodup.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137455595613---gofuwilijanulim.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/67929957919.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/54680055883.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/navorusakezosas.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/vegilibewelebajefinazim.pdfIn PDF document text
    • http://iscelenie.info/files/file/fuxabizaxifajefozekofifom.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323aec39dc2---52159087632.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456863b7754---bakomugavobabebu.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/33852132970.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/78074821557.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd32b28f---petodujevuzodiw.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/66347731105.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/1597780651.pdfIn PDF document text
    • http://orenprom.com/img/account/file/34726987906.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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 10696 bytes
SHA-256: 05c9782e0d0086483e1d882920f861063069d45811aa1f42a81755d36ca605c7
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 17488 bytes
SHA-256: 050c24fe998c8af904cba382451d27c6932c9b46342b871e9c86e2eae9d83c61

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