Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1a16e3f569c610…

MALICIOUS

PDF

88.9 KB Created: 2021-09-23 05:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 231628449ea07df0bdfdf93ad37e9c69 SHA-1: 98b7f851e6fc43461bd2210509112390260d5f2c SHA-256: af1a16e3f569c61033821ba03e3fef3397cf965744d036d93af8f9d405385701
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=telugu+new+movie+online+play PDF link annotation
    • http://abogarestudio.com/userfiles/file/78710757856.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae0469669f---zonebasirujaziverufefi.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/58482132652.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/78879801543.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/midasogiki.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/daxefegowitowofubugepogoz.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631398417.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303526087f4---fagusofufabelu.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/76243431178.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/xedagevivuvelupijasosed.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa99a6eb25---27747251260.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/bekuxozalexojeraxam.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/70917005325.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/fitugijepejiteru.pdfIn PDF document text
    • http://hasyo.net/files/file/romogokimuli.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210919_CD0AC248EA2941B0.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/vonapijejuvojew.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/47413099783.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/gebafiz.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/50917ee49930b1a8148e2c5b94d4a23e/80705083629.pdfIn PDF document text
    • http://chinalabware.net/d/files/45329719297.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/47032751039.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/69838597278.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/105bef35cc8e1fa88688f5ca0a22a5e6/zulixuned.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/xegol.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_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 18072 bytes
SHA-256: 26ac4e0cd92cb2e622f09a9a0687f1699f3e6bca9bc35f496f12e143436ebb46
font_01_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 10560 bytes
SHA-256: e95bdba8a4b64aca9bcd5eba66b26f6ca959b8ae474fc5a6dca4ee62b0758262
font_02_sfnt_off00013dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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