Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89449807dc4fb42…

MALICIOUS

PDF

96.1 KB Created: 2021-09-24 07:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a6a7cb3acf50b1a818f41a5d4125a3d0 SHA-1: d5e088e27e9e46e3cb5df71c55c377619b0c558c SHA-256: c89449807dc4fb4207e9a1311df8130d1f25cb31f14f517e858baccfb619c62a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://uslugi-ogrodnicze.pl/pliki/File/wagadatamuku.pdf In PDF document text
    • http://tries.cz/media/images/upload/file/44127305081.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/90942087687.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/debunelaxug.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zomufonizat.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/572d1d0d38b072bb01ff55c40396afbf/24347879019.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/pozuzawadeja.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/9821268372.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/givaxivenugesetebivanik.pdfIn PDF document text
    • http://sro52.ru/uploads/files/61607818108.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78fa0d3ff---vokinal.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/60125017457.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/63871894033.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/73364855154.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/xufebes.pdfIn PDF document text
    • http://1careglobal.com/upload/files/jifuginojosi.pdfIn PDF document text
    • https://pisausakti.com/contents/files/64486688249.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1df4f290c---tedajanukojek.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/96766750285.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/93993460496.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xibelubobaselaxizoreg.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/reredifesuridaduruk.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/widixewuxanuzonogusejomu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b76555854151fe2c98c0639f21144e54/tajakep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aashiq+full+moviePDF 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_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 10468 bytes
SHA-256: 2516c65e56cad08fe92b9357ac50e0ec9bb0e742a2a90c1a9a138cc8ca3f42f9
font_01_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 17456 bytes
SHA-256: 3e1b274ad329b00e0defc0d03cd970587d995604743bf2a33fc53a625499625a
font_02_sfnt_off00015af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1