Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec29ff3429c052b5…

MALICIOUS

PDF

86.5 KB Created: 2021-07-24 10:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7bc6d580e54531970f3c33e119476b82 SHA-1: a0ac732f5fe7dc2898a9693fe57fe32912dc909d SHA-256: ec29ff3429c052b53f87e47a4e7322eeaf8a154363b4a416282a46b72d493c10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d51a25c6b4---37407446269.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7869f4e3---roxebagoluzuveruputumef.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/83002132008.pdfIn PDF document text
    • http://mega.kz/media/upload/files/18809632766.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8c5p3r1qvqd6cel17qvgcv39p3/mulopofobad.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160730ec3aa656---degefogonefeloje.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210605195630.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e39251f3---visogurikez.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/eedbe43ed4219b85336b0bfaaf18c743/vejedinofobutakalejepa.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/82397560372.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0aaa53493---74570570758.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/sokojenaw.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/xidalovejumawefofaviwinu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/e1bka9ikanierq6buhf58skr4i/12056821257.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/puvagividitazatom.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/fubopafiwudujemelev.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/61212111897.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/jafisuriwev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7102715b9---24328620258.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/dunitotozokivegupu.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/dugonefuzakirixedakawak.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/sanokipasumavezotifigop.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e497cc80649---kagofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=black+and+decker+coffee+maker+clean+light+blinkingPDF 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_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16892 bytes
SHA-256: 65a9df9199beb66a8236536cc9d7c5ef8c811a1949de85c97eccc78e5ecfedfa
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 11040 bytes
SHA-256: 4ed6ef22708028a01a333e873c7c75437868348c2dbbcadde87df94c62a9ae7a
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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