Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7eb9a882ee66a12…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 02:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 97ff9c472b4f0cfc105064f01b79c938 SHA-1: b56efa2825d190965bf080616e42442beb704606 SHA-256: f7eb9a882ee66a1271d3c06c00d5638ef55969e43373151f6e4c5f826b7c7378
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

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://queure.ru/uplcv?utm_term=game+turbo+apk+for+android PDF link annotation
    • http://ssss-sangam.com/userfiles/file/44095746892.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383a3b662ee---87937725981.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/suruligaf.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/buwidunirurigiri.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/wopozobofinosunapin.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7f165e04---lanomiwapemuxinojelikeme.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/60490411171.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/kofodibanowigeperoru.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/gisukuz.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dc36c70612c88553c137155c057edf89/zakokavovitipazuxe.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210909_63A7622DC17CD6A9.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/81585742502.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pigujej.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f98e6bcc---66360097743.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2235aa2c513b3057e050d3970046994f/mugukiburezobasovuden.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/77948227102.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/godezipezupefimuwobubed.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/92147278087.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/87593218257.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zivakubebatalikabaf.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/67776622222.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/79463693469.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/8057104300.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_off0000cb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10816 bytes
SHA-256: 223ea0f4ede11cbef98b8006c8ac6391abb6cc55e213056194ed1ab4cf318d7b
font_02_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 17008 bytes
SHA-256: eaafed78d0822cef998b40667baf477d0bd6309630e79762be971c211de8dab9

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