Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef59bdb97b966d71…

MALICIOUS

PDF

76.7 KB Created: 2021-09-24 03:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4170f84d050825ec2e5a3548068707f3 SHA-1: 402d5afc287c0981a756d23eefd99cd1aba3d698 SHA-256: ef59bdb97b966d71977e5233745599561f94df30376bc2a6dab732ae1a443126
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=gun+mayhem+1+unblocked PDF link annotation
    • http://jinanxintiandi.com/userfiles/files/babarugoval.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/baxopumakoxetokafosijezuf.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/wironeketamamolakanifofuw.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/walupevujodenulowowefovo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcgf8vt5ivj6q5elhn2k6902r3/53492214400.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/64118311522.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/wugadebili.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/80910627388.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kivosikudawexedawapopi.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/ponivigodebuvub.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/74105532568.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bokavitaniz.pdfIn PDF document text
    • http://bociany.sk/media/file/65728407183.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6cbe5f23f---64368411298.pdfIn PDF document text
    • http://maribon.net/app/webroot/files/userfiles/files/53413076380.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/gawutufago.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/ronimuzufolipudasekapikaj.pdfIn PDF document text
    • https://mlspoland.co/files/file/60554882000.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/vunugap.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161408fc518027---6166873901.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/68018995015.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/79997895380.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/54599599850.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/11416305758.pdfIn PDF document text
    • http://fruitvita.com/files/files/wajebipero.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/13832282709.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/25595204369.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_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10712 bytes
SHA-256: 3fda39dc97194e7b85848824746cdda4b6f1dd37b1bae65a55ffa8c31af7df60
font_02_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 16892 bytes
SHA-256: cdf78fdd8709ee7d096de3216cb265395745a3beffb5c229ae1571e22298f405

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