Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce640fd716bf1e96…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 23:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48cbd300507f182916ea9780d5d316a0 SHA-1: d147eee9e813f73cf64fd0390e04650f85e81123 SHA-256: ce640fd716bf1e96d99cae7cd48bd2db7224edd4d7fd4dfa942ea0758245a14e
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. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ohmytour.kr/FileData/ckfinder/files/20210724_533DEE6CBD31C8FF.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ligumenunuvumoxodaloxofe.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/84f4a46dc0d293f340991da756c48861/30878501916.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/sewigeruzaxikuvevameni.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/taxevetifipubu.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/zenusajexaro.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/tubunarijugunedazifanufev.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kb5dacs46j06ugef18rp2lgg94/87992629326.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/jafem.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/22042354763.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/zazukenanew.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/cd5abbc53b7e872c964080002c0c1538/nujaruxavod.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/77365465557.pdfIn PDF document text
    • http://sooclose.eu/upload/File/retupebivolizaf.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kodegegawugamega.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/bad84b4a714a989a7e3d928ed4a14ac0/86203752352.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/ladojamaxavibuvag.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb52e5f9a0---gipafesuxabufunukan.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1b1084c---89000200970.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/279abefe29510b627e5070cc43c5cf85/godotaritibix.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441af4a98f---zizukeku.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7541491d00---59392967276.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7177f85c---bekuzimadoxokefarerufiwu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/69191470114.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4aaf248609d1e1bb17f378fa68442fc8/sefomalodutugek.pdfIn PDF document text
    • http://njxinbell.com/upload/files/59012250218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=integer+exponents+worksheets+8th+grade+answersPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 18360 bytes
SHA-256: c4a56e8bf96b77f9ca48c61b060959b9959512ab182d6ff7ac4d44ced405638b
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 10972 bytes
SHA-256: eb5d973577cc742d035fb29cd0510f462acad68256b2e4d5837ec167156b2b59

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