Malicious PDF — malware analysis report

Static analysis result for SHA-256 89aa1d0b0eb2fcd7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-23 20:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8bb80b2c75a0bd5ae3073f42fdd4274 SHA-1: 359b2f17f4f3137ad6f50126beba39d66b7dbc1e SHA-256: 89aa1d0b0eb2fcd7f8df86816a820c8d9b8268c7ac4ff391a08af800f65361a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical heuristics indicating a PDF phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple potentially compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://valencia.thepokeluau.com/uploads/files/movatuw.pdf In PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/56793414740.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/tudolis.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/82314577269.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/76046874608.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/nilekiriwavusizonu.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/14420986253.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zurotejojexez.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/saxoleketetasa.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/10417678581.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/pagojalag.pdfIn PDF document text
    • http://cissi.it/userfiles/files/kavukopevodumofore.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/zokan.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/razarasigitelevugalenik.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/18596291204.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/loleta.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a6c87a4e0---besevikesizipadepiki.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/sekawifuzusoxip.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/wenegemijaw.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332a7c992dd---bamevajitukof.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4a950eb5---jarer.pdfIn PDF document text
    • https://trakyasoftavukatwebsitesi.demowebsiteleri.com/upload/files/gogerijinirawanefituwi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/68449932869.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/13864624837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ben+10+omniverse+games+apkPDF 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_off0000b5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CB 16152 bytes
SHA-256: 573dc18cf06ec25b4ae6ac5be22ec568c5a741e64c395b071c6da585c694e21e
font_01_sfnt_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 10836 bytes
SHA-256: 8f983c2ede2eccdc9d21739539e8932be13320cd45e89e87825a1bf1ce678d1b
font_02_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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