Malicious PDF — malware analysis report

Static analysis result for SHA-256 9897a51c89d11d79…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 01:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5cc62c051a17333339836f225baa37c SHA-1: 51c0910ac1240a795b31c954da0fc9774656c83d SHA-256: 9897a51c89d11d79a5744bb15c43ae211d512a70ca79847cf3c3e6a638f27016
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, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=2010+volvo+xc90+owners+manual+pdf PDF link annotation
    • http://3asoft.vn/img/files/3688594475.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160940f4ceb3c5---rasarolikobeb.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/66541c369cee1f8c944081c2e1c681f9/xugelomelamefaxotire.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/83861845936.pdfIn PDF document text
    • http://kite-surf.sk/files/60551596314.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/lojuxipojom.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/59612381676.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/5213895080.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/71210865942.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210703121040_1192867436.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8489982d---doxupezaxu.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/65913731476.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16076ac913541f---dofifetora.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/26270384965.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/16614130068.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/74ec0e9bcca81370526e9be23208fb0a/pitaxabuvuxokamujixup.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/22596689880.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5ada242f159c3590a215beaacc332c5c/17869643711.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/8142857431.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/xuzamagaxumiwutugetimigo.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ulr391lobo2ek2rcbmtr9q4be1/gedogepomulitekudodosar.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/69343743932.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_off0000c46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 11312 bytes
SHA-256: fd0bf4fdffee1137fbe755a689f938190358bde13f81073549fd7f4978410a00
font_02_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 17684 bytes
SHA-256: ec402aeba3a4849491cec692a61572ef9e2255079bf5040fbd555da4f9d4cd13