Malicious PDF — malware analysis report

Static analysis result for SHA-256 7970d9f5b5a85f65…

MALICIOUS

PDF

79.9 KB Created: 2021-08-17 12:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5ae3a1c3d169084f97968215e2b61b0 SHA-1: 77fdf8227e44b7458046470666ae8ec236ddf5a4 SHA-256: 7970d9f5b5a85f658277540cdcc0ca46203bac883e0a00d50063f4c75b9c36c2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eko-inwest.eu/upload/file/73097050950.pdf In PDF document text
    • https://ginniglobal.com/uploads/file/xupiwiwoxejiri.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608212da1e8a2---58839989681.pdfIn PDF document text
    • https://vleek.com/uploads/files/rufatogowimuwevakikagaluf.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/99610924698.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/78683126938.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b877e56513---jotaxojinosazasovo.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/17981737620.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/tuwanus.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084396a72b2f---38334393823.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/powuguse.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/laseza.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/53869646962.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaab0ac05c---65217967564.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/86828402245.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210606090753131.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/63089918722.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/matedujakedikibimuj.pdfIn PDF document text
    • https://cargotavio.ru/files/file/sepufodetobezo.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/94287199592.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8f64a5f8e5675c76088ef20be8999d75/razavimutupunozabomevi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610baa6603a85---87905140049.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/fikulatitekegero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gana+sudhakar+mp3+song+download+tamil+masstamilanPDF 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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 11196 bytes
SHA-256: f35f9b73e65de8afdbc1b248332079908498c8ec90e4a5bfa8ca8b7135d0234b
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 17308 bytes
SHA-256: 0ff0f7fce258490c61b13539765cf9a78b241e4794574b75bf1861664a20bc66
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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