Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68c9f794471ceba…

MALICIOUS

PDF

86.6 KB Created: 2021-10-05 08:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08a98adac29a9bd4ea35e273c6c9e5aa SHA-1: 32597a05b59fc5532b92ca4359b54fe30f7c91e7 SHA-256: c68c9f794471cebaab11310136ac64698bb320ca516047aa6ebe847630052592
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://webbuilders.com/files/file/pafidijijovopubexupimalu.pdf In PDF document text
    • https://sibois.eu/userfiles/file/piruboja.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/35666820077.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bugobateriduvisovolu.pdfIn PDF document text
    • https://desco.scp.hr/files/fuxale.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/votoluzajuvedepugorira.pdfIn PDF document text
    • http://ridendo.cz/files/file/ruzimafejuna.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/xonotezebanun.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/doxamafirusipanukili.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/jafitilidewaregeraki.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/vukiweninutopalowim.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/40657134220.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/vatirabij.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kuxoxemapajaxakukevozo.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/loxokenujexigepapi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7nr2uuf0v2spu34pjgnl9jrg8j/sidewimodilukosijebepur.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b478f572e4559cbc586a6ee0748ec2db/87943178043.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/13162583467.pdfIn PDF document text
    • http://szcftz.com/upload/91175051955.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/29887307560.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/54847593403.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/12b02a86eeb4849ab93b233bdb7b2ac0/kurobogapibulup.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c65a6af66e79c3b47f5f94af36c7ee17/20061311552.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fb792ef2bff0cc00ea9bd7efebba0fc0/letororeloxa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bec18c926c---64603788651.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/81877184193.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/gojitiluxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=different+c+chords+pianoPDF 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_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 10672 bytes
SHA-256: be5c96c709bcf010702fbabdad40cd9d596d60e1f781ee5d5d9433b860c3812e
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 19736 bytes
SHA-256: a5ebfd9dd438f5563beaf1356d7c181ceeac8945a03c75d981c072a4a71d4410

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