Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11547316d2c6610…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 22:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63a18f98ca39a3d61b9556d498e7555c SHA-1: 381407e377eb48d8720c512ba876deca79f40427 SHA-256: a11547316d2c6610381f09fde6f1defe7a6de4565804eed057f4141440baabef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, several of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and contains no readable text, suggesting it's designed to be non-transparent to analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/445b5ee270da88044471731d5306ff93/vamusototimijikeli.pdf In PDF document text
    • http://smcertificationservices.com/userfiles/files/gadupunarukurawunivuki.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/mizufezifuxewana.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/xuxupijumuzomil.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435a6964648---vowidekekuzebemoveruzo.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/piwogekisiwonuvuxiwa.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/xevoxu.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/kojalukomowegazes.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/79757209576.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/mijigetifuvufujaduwab.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5226dfe5---43269972935.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-05/210905122508936122289glg0ih0nd.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/25692483408.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/79765007682.pdfIn PDF document text
    • http://arucax.am/user_images/file/vebosagopigikimiwanufaw.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/jolikolefav.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/92411239947.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/7213448228.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/luzuk.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b34b5091aedfbf58e5fb2d31826168f1/81422800954.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/kigufosesilasajuvimezipud.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/27831356645.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/sowegefamogavar.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/45455884556.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/papadixetubulasedina.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/79970937405.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26675360416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=shiv+wallpaper+hd+download+for+android+mobilePDF 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_off0000dba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA3 10864 bytes
SHA-256: 6a3524cfabf90806875ead13ba58716de7f949b2fc29a18aadc81adf9407fa7d
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 17236 bytes
SHA-256: ef5a89bbd3f1b4a979b73c5d5c1068693b2f6603bce231f0308b86939a9bb010
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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