Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fc18249f7b0836…

MALICIOUS

PDF

91.8 KB Created: 2021-07-07 19:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5359f91a853ce9b5e41221c0de8e7f70 SHA-1: 44c75c2b1a7fe15831b652c04db07d434b3bf157 SHA-256: e3fc18249f7b08367d6d3b7a3c615b8268a914716efb2ba0b956210dc8489485
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to numerous external websites, several of which are hosted on compromised WordPress upload directories. This suggests a phishing or malware distribution scheme leveraging these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=bible+quizzes+questions+and+answers PDF link annotation
    • https://alternatifhirdavat.com/upload/ckfinder/files/letilexoburixorubada.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f15d24241---26304324789.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/dufelisolutazana.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b917965aa---38214657982.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/33415958343.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abc16f10e43e1d443f4a85b2c864576f/79405494071.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba387e4338277b1b77baa7d39a3b146e/76282090770.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/lepegubudogixit.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/10432040495.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/62616570094.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/dufesajutoxixitepuzanup.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/wijojuduvedamegejo.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609131ab1b769---53910359839.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d9abc4ee0b8b978de17043b6110f40e5/91488979028.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/160fd53f674c260466fbe7a901379f93/sazupupevudogikesu.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/41490057689.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ae6cbbc7d---86662308068.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c10d6a98f---logabigitiboxibopokinitid.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kekomudafibaguriletawodu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2d0e2721bafe79e5b2eb4e1ddaf628b6/nijetasarumapinibafofi.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/zoguz.pdfIn PDF document text
    • http://davcpundri.com/css/file/fefig.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/66201912384.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_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 17332 bytes
SHA-256: 023b8c352d4f109e5d1be8285b5a355d2057374469007be7f5ab391f7712b7fd
font_02_sfnt_off00014906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14906 10828 bytes
SHA-256: b2b9b0a9d3d3d3d87e084c94258e0a34e2f5d426a6fef7af275f5d861d0eb8df

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