Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1eebb38f5cf891…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 08:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2797588ef2361dc223b7b4b2918730cb SHA-1: fb0460140b6212a0d3a0e9efe9d5764f5525f5d1 SHA-256: cb1eebb38f5cf89156be9af90a221c3f182ba2a9e7bd6aa7167066a88c28b22a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV specifically detecting it as a phishing trojan. The document employs an image-only lure, typical of phishing, and contains numerous embedded links pointing to potentially compromised websites or disposable hosting. The presence of an embedded JavaScript stream suggests an attempt to execute malicious code, likely to redirect the user to a phishing site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://geopraxis.it/userfiles/files/fiwiverokitu.pdf In PDF document text
    • https://baptistfriends.org/media/zabawodani.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/donapop.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/rudireralarosajekotisi.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/jasemav.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/5997315513.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16143f9a9eb6a0---13835013569.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/60217134742.pdfIn PDF document text
    • http://crediramasrl.it/public/file/dekofodugedup.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcf166bb8a---72809357478.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cac4e0cd3eb18a68eb6c2a3668ef1252/71963039525.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/11252839634.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/sexerajavowapogejivu.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/56551637709.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/wazowutitelodotofexiwitaj.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210919_221801.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/kedoramapoziwozidib.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109050248405967.pdfIn PDF document text
    • https://www.confirmedtour.com/files/dufojanedimug.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/milobiduxug.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/38446874040.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/46039115577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+record+audio+on+my+android+phonePDF 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_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 14016 bytes
SHA-256: 2ee567a7b55d7add7a2eb79379bdb7f654bf4f9d61341e00f0f2845e8d0b24ae
font_01_sfnt_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 10756 bytes
SHA-256: 5f51f094b6c46edf3baa0c8f1601587f6ec61258fe2aa6621df0801461c0fd8b
font_02_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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