Malicious PDF — malware analysis report

Static analysis result for SHA-256 5563d89dc86a23c2…

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 21:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 719315894284b352e8f3eab3748bc7d4 SHA-1: 55bfb9a2e94cdb342e37bf566d29f2041cfe95e2 SHA-256: 5563d89dc86a23c2e9f9dbc6c8533b3e2978201d4cbc286b6166f6206c5c05f2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting sites. These links likely serve to redirect users to phishing pages or further malicious content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://alrabbancapital.com/file/files/fudepakoselizazozel.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/52625b4884c6eb51e746cd95da4f9abf/2750216843.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/7519567285.pdfIn PDF document text
    • http://rhondachem.com/d/files/89702841657.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ktr0mt2u1tlghrm55hvahif91v/gobutiwadarujosij.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/ledixatowafajisu.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/54860017802.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/41097821716.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/22480701364.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/99979869217.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xiwedosafevivedi.pdfIn PDF document text
    • https://pratham.one/file/vaxupeji.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/soseziwajub.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/60393390462.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/46190976551.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb20754c0a---wujulimivegu.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/95478165246.pdfIn PDF document text
    • https://unosms.us/userfiles/file/tosiwedobozivesizu.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/xetopogipududo.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/zagewitubase.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/gelitovibofuw.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/74219060578.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/zoton.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/putinefugedageg.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/ruzubuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+fly+with+an+elytraPDF 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_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 18108 bytes
SHA-256: 5721a3c4954f4ff5d5e692f85a2c6d28bd7b1db013c34ae003e35d5d7f481b0e
font_01_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 10572 bytes
SHA-256: 5fbbbcb1e3bc1ab243e91b7af95ef8b182b41b5ae3ef30067a7056ee946af17e
font_02_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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