Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a6e1061a73bbeb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 12:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9c41fa2198c26b56ae6f026cfaa71e1 SHA-1: 121de49114684d7adc70150fc17e220273e0fec9 SHA-256: b4a6e1061a73bbebfa6e1e57b6bf4bd1d3b5c7da1af88cae644f614dc94be539
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal embedded JavaScript and multiple external URIs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF likely exploits vulnerabilities or uses social engineering to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://blow-w124.com/js/upload/files/72326406011.pdf In PDF document text
    • http://landpas.pl/upload/file/gizavitonabuliduselu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/58d0f6498ccec897051b2b23193baafb/nedonesetoki.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/kibifetajaxibo.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/sozizepoduzawa.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/fevadisapivutebofutoguf.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/tibusuzuwubowilukuf.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f19f423d---56585697673.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wuwilitewumolike.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/kiveti.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/59479560673.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210906231448.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/11464078621.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/13550655316.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/91128927526.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/59797946928.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/wodijala.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae4aa5856---80130345397.pdfIn PDF document text
    • https://priscar.com/documents/files/99897949344.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/12772129346.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/52502611457.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/vativovi.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/34702505049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dearly+margaret+atwood+pdfPDF 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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 10680 bytes
SHA-256: 4722c6c854aadeb1c9de80228a99e46859a892d06a4885b37bb32a9ed698570a
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 17008 bytes
SHA-256: 13c188b1b5c1d4b57bc93a73a728b20d2d331e5d492ab4cc0712d1ca8f372fb6

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