Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cf219a0fccb0e6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 13:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5fc76ba2d02987c51e938d2678e4b1c3 SHA-1: 3e36557e7a66e2320f357f664affc1c2530745a3 SHA-256: 13cf219a0fccb0e625e3dbb95430053e5688f245885a607d4cc556f81acccb60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://novichiha.ru/pic/file/9522211574.pdf In PDF document text
    • https://12shio4.com/contents/files/badiwiwobavewawuzo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3cupk7gp47qm8r6mjc14k7svnj/revom.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/55963260571.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/94158710712.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/pawexokuvinetaj.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965de835e36---nitivutolumapumaxex.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/75548803380.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/leriwasunoj.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/25635966170.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb296ee010c---lajelukitefogamoxeb.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6bf3d900e710faf875cbd3816810e533/14575352943.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3edcfa2a---dujokenezetilewawu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a426a900520---47606467251.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/61910013177.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707caf4d289---66347976903.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/444a7b1fac958956d6bf2666aa2ee42b/jaxupelevijawojalag.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/wuwemiwixilixipivuzu.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/pizumanififumumufefer.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c76cd647a496dd14d79a23010d9b45f2/57277912018.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/bisuku.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160949afb8beb0---linitewariton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=think+and+grow+rich+in+urdu+pdf+free+downloadPDF 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_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 10872 bytes
SHA-256: 6dc6839a098f664a4f2a528a14aa9972e237fbecc64fe7b223eebdf30ec7670b
font_01_sfnt_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 17528 bytes
SHA-256: 192e3e4196dcec41fd47e402697a16ca6db6613207d378ff2a716d32cadd8446

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