Malicious PDF — malware analysis report

Static analysis result for SHA-256 41961d6cd8eba52c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 22:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f81efa0600ec2f391f06737a56e0cc3 SHA-1: 7f93be8c234cf5d7dbae20d5ff81be541622e11e SHA-256: 41961d6cd8eba52ca584dfda95e858f2cb8ae11a3107c6862fd7901072fda522
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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=equalizer+music+player+booster+apk+download PDF link annotation
    • http://allivecoat.com/userData/board/file/tidisolasiseten.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/pobebup.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pitubuvunav.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/gonunibido.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/72517637416.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/witigemenurokoluw.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/50696237739.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/934f3d8f6b212af4726b84c3bcf316a6/25518889400.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/26800833925.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/25483577282.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/62226540623.pdfIn PDF document text
    • http://drironcat.com/images/file/zagubapitinelapigatonimi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/lomovafitetinulerofopoja.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/75554369792.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/69003115355.pdfIn PDF document text
    • https://kiptep.ru/file/87546581236.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/wutigozalalebipanoxam.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/ditafatinotugefegigem.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/19984274721.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/83634345584.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1c2b7200---resazivigataz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc8503b77---47170084589.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/ganipovarir.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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 11396 bytes
SHA-256: 5f50a361128afb26c5bfaf4c3ef57fdaa6c3bd24d0903aaca918d0e244019434
font_02_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16656 bytes
SHA-256: 98070d2b18fa4355fcf6fb0ca9306b701a2451abc43f2b9b94f45050cc369db8

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