Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffea300b54e76de…

MALICIOUS

PDF

86.6 KB Created: 2021-07-20 00:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33eccd8817ebc0f859ba7e500e8e7aac SHA-1: 0a4ccd376810a94580efda163a585edb36b9edb8 SHA-256: 0ffea300b54e76deb36acea7661517a3e03c6b378c351b7b17fa8361cc762266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload storage, with numerous links pointing to PDF files on various domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2340d7cf23fa193ec63776d3fb783136/54960965514.pdf
    • http://loaamtran.com/files/usersfiles/files/tufed.pdf
    • http://fw-simple.com/uploads/files/zozituvobuzafu.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc816ea775---83573995813.pdf
    • http://sportsgarten.com/editorData/file/22438379411.pdf
    • https://mashura.co/userfiles/files/lasolot.pdf
    • http://servicedental.it/userfiles/files/36589957419.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813ff7f3c98---72479163650.pdf
    • http://bjjiffy.com/upload/lajoxuweguburus.pdf
    • https://jgranit.pl/userfiles/file/47897899021.pdf
    • http://aarogyamedico.com/userfiles/file/73281269371.pdf
    • http://wernitznigg.at/files/pizapamonasikezedifeb.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4e448a70afb0196e6373255535384c45/22503929993.pdf
    • http://akwarella.pl/user_uploads/file/rafikudedesilegisedali.pdf
    • https://zzwgjx.com/d/files/42273853822.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6tdoqos9ctc01rba19trjn6ol7/laxikijo.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/77717301031.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/95a147362411c581e9d14c67f40f2586/86432141138.pdf
    • http://uctodane.cz/UserFiles/File/wekapejil.pdf
    • http://pusancard.com/userData/board/file/74209486228.pdf
    • https://numberonerevolution.it/file/duxatisamerewedilolokin.pdf
    • http://php-lounge.de/userfiles/file/92381381452.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097d8de4e7c2---nilupupoxobokexosibexitor.pdf
    • http://www.puhito.hu/uploads/87437565885.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1984166ebc---pexuwanusuvukuronixalow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2+letter+words+beginning+with+k
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edae.bin
3fbccb67f7a5fba700bf66c90969030f6f1f707b411d769c900193af108a6389
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 17808 bytes
font_01_sfnt_off00011c7a.bin
1ad454daaac930b4809a025dbc829eafe7c9b0fefc342a2313d5b6226e09d625
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 10704 bytes
font_02_sfnt_off000134d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 16792 bytes