Malicious PDF — malware analysis report

Static analysis result for SHA-256 3174423ebd867790…

MALICIOUS

PDF

80.5 KB Created: 2021-08-20 10:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 89dff403b8f14b2653a3f95e94be7e9b SHA-1: 7349478ca9b6545f579c74443126829c7f562d6e SHA-256: 3174423ebd867790ae16d613403838cffbb8ca45e27a2a747c9f64a37d7bab45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=shells+short+story+by+cynthia+rylant+pdf PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609853b4831a6---1640795844.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/bovipepizodisenerisunax.pdfIn PDF document text
    • https://tavio.ru/files/file/41584411358.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160841c33ed9fd---37977962630.pdfIn PDF document text
    • http://akssert.com/userfiles/files/39722498527.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331f6c78ef---fasugoxetomezavoxipunu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f190cb223---nusimerevomobozibax.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/kejowiz.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rvr3fl43bprqrva7jrdtrtrftt/16233732576.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c113884f73f939103657f22519eeb970/99086398892.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/16f876c2320d50a56bbaa4e068969817/tunirezatagenejizi.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/19777308977.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/441d34bd6de687b26fd0ab0ee80fa663/rarusojutu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840bc084f4a---40036188750.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6085345439---rakoxezogupisuset.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/kutowuloxokeseju.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tugekup.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/tefuvizakuzidofufakidanig.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/abc952fbc688ab701551a4f614b47e7a/75262689197.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/72821160838.pdfIn PDF document text
    • http://aimic.com/userfiles/file/41414713323.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/96d2ico2qmkmb261f1f1nr14v9/5985424604.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/bipagodolum.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/49891589258.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_off0000d7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 16612 bytes
SHA-256: 6530d83203df103bd8a7feb4bb43bcb1382cba708614c40eded38f37e65dad27
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 11044 bytes
SHA-256: ed891f9ec6ffe7d4b2ba62dc6f31475bb9ecac51be5b6d3cc3572ea5ee89a5de
font_02_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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