Malicious PDF — malware analysis report

Static analysis result for SHA-256 305cfef7836ef5cd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 21:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45a027a3b01a2ec003982a454523ac2a SHA-1: d8e060ae8509267c25d2cc02bcc56d4a24bfd4c5 SHA-256: 305cfef7836ef5cdc390cee4b14741dc7ce8a6b874e8704298a1c0cf14a75c00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a link farm pointing to multiple disposable domains and compromised WordPress sites, likely intended to redirect users to malicious content or download further payloads. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jurabos.nl/include/editor/file/dumajotunifuxefugapini.pdf In PDF document text
    • http://a-mega.ua/images/uploads/file/mikazewavevaret.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a599e2e1a---38875157051.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/61991789064.pdfIn PDF document text
    • http://rnralpha.cz/res/file/60544028072.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/29313022676.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/16692310678.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/19009771863.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109081512152256.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebeaa0fe23---13381135622.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/51409455560.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/zevovowowisilusewevat.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/12147822188.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/zuzevipara.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/gibitikebovabegigejijo.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/tojugonosajopinadafarozul.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f73cde48c---mevebosexexasaw.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/36324201129.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/59295067814.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/sewasugofizawidivu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/newasamozosunorawex.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/58933093540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=english+grammar+practice+worksheet+class+9PDF 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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 11152 bytes
SHA-256: 79591163e91bbfc3eaa24991f2c838572e8222fdeb68d7d69251224105bde7ff
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 17200 bytes
SHA-256: 2c12180a36d24fb5a121ca6be93ede5b86c139387115f1c3bb14905c2ed43045

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