Malicious PDF — malware analysis report

Static analysis result for SHA-256 41abe6154ace8e7c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 00:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aca6052eb76c9180c5724760e98782d SHA-1: da94d507bff931fe1f6baee268c5331a33f9c394 SHA-256: 41abe6154ace8e7c9a04b51b02bcb5c28c41f7430c9e0fe94d447af3a643b27a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://contemporaryteas.in/admin/uploads/file/dabemipevofifugazaxuje.pdf
    • http://orderbestwings.com/uploads/files/52086948441.pdf
    • http://thepokewave.com/uploads/files/99991053733.pdf
    • http://amsaneeraus.fi/userfiles/files/bazijexopujofoxeze.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cf11bf91---japolubu.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a6cea24ee56b838015efd65c20d1d28/35868639472.pdf
    • http://tnshoppingbag.com/upfiles/file/68737463283.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/9e809bc129af4209c4c8d93e48cc1cd1/46687602635.pdf
    • https://suncables.co/images/file/kejukisezu.pdf
    • http://ginzaramen.us/uploads/files/luxanedetoninoledi.pdf
    • http://bandbaajabarat.com/ci/userfiles/files/ramazepizujuxaribul.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/wuxomajevatadekizavutox.pdf
    • https://vinaconexmec.vn/uploads/news_file/44504374962.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364f97b8f54---82203047476.pdf
    • http://parbatsamajjapan.com/img/files/files/molawikojatudifaxipib.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136f98e51659---3472117792.pdf
    • https://ntct.dz/ckfinder/userfiles/files/87582780185.pdf
    • https://bakotech.at/uploads/ckeditor/files/regujugizifodopelaguwa.pdf
    • http://kingkady.com/uploadfile/files/nogevenajol.pdf
    • https://stichtingech.org/ckfinder/userfiles/files/pipezoxolikanopazoder.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/47817719321.pdf
    • http://comp-art.ru/userfiles/file/86618382523.pdf
    • http://asfalon.com/__files/file/17468333952.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/nekewewekirogefikevag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pokerstars+android+tablet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e470.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 16792 bytes
font_01_sfnt_off0000fc82.bin
5c8dcf9585d24df3feea27028a78b95cf886a000fd823d472d0b311702e7b9f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 17616 bytes
font_02_sfnt_off00012a44.bin
5dee673099a875a99a6eac8e4e92ce7824a92d08183fe449d1317c0671857516
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 10472 bytes