Malicious PDF — malware analysis report

Static analysis result for SHA-256 331aeb582a3f7f48…

MALICIOUS

PDF

93.8 KB Created: 2021-08-13 15:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff57516e93dceb4f14ea2cba940ab233 SHA-1: 6080b7ccfd07d944fce819590b0236f0f9322f4d SHA-256: 331aeb582a3f7f48d7c270e6db7885a70fbd0c25919ac535c76ddd67b8acfa10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://woodwork.pl/ubezpiecz/obrazy/file/74073552370.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fd2ab5e34---rironosafogevovoxuguxabis.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97f9a01f0---75361510059.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6197b0c408---riradujomedelevak.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/63ee76c706cdbed098163aaffee0cec1/megabuxela.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/letabosu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/65273682726.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/pajarogimirofevel.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/deeb08e9917478f7499665bc9d6512c7/78345051792.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aa1355ad1---84717628747.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vchcqv42oaumf9r0mk13lolnf4/2264657406.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/99324749919.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216333327064.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/69522922718.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-21/20210621034748421420.pdfIn PDF document text
    • https://tch.lu/files/files/4401330791.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1622479091608d419350931.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e710f33e8a40353c7c9bb4f6a3a8ee42/nukeloliladamuxeroxezazer.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/xoroxowigolobatig.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908767d5f27---11027282679.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/63856032501.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/11928915737.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb2cdfe31---dewusipez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lecturas+cortas+para+ni%C3%B1os+de+tercer+grado+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2e50868f7---wirozupe.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_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 11012 bytes
SHA-256: 4138d6b7560e1bae85ecedeb004751c8ffeca17b624f27284a15b58ba0e1d350
font_01_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 18380 bytes
SHA-256: cfd6b3fe359c12361f011cbc5fefc52df2f565bb9168351091c1d2d2ae29beaa
font_02_sfnt_off00014e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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