Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea43b27daa46abe…

MALICIOUS

PDF

75.0 KB Created: 2021-09-27 12:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6854fadfb0211f424dc7e01586bcfe12 SHA-1: 3d6db541cfbba00e6600d50926c582fa7dbf0921 SHA-256: 8ea43b27daa46abea1db679aa0f175d56e8253ce8ae320005cdbdb12fe88528c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gamecoast.by/uploads/files/65530121399.pdf
    • http://floridare.ru/app/webroot/img/uploads/file/230703_30597472888.pdf
    • https://rockyhotelsgroup.com/uploaded/files/99263515789.pdf
    • http://apple888.vn/luutru/files/56189189900.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613165ed8b14f---luwepipadalisesodan.pdf
    • http://indigobaby.eu/upload/files/96957212290.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/zakakaninikovob.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16147d606c5bbb---60147393095.pdf
    • http://sieuthicayxanh.vn/webroot/img/files/91466416404.pdf
    • http://christopherspubandgrille.com/userfiles/files/3781251028.pdf
    • https://easternresources.net/ckfinder/userfiles/files/patepanopezatufowapenof.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/21669037615.pdf
    • http://realestatespoznan.com/uploads/23314247371.pdf
    • http://capitolmetrophysicaltherapy.com/files/files/jifelumexijogarejibolosug.pdf
    • http://qianxi.cn/filespath/files/20210904031500.pdf
    • http://bonezi.morefriendship.com/upload/files/soveretudumutanutezom.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/bibodubijemonozo.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c84254fc---lujemawegom.pdf
    • http://safiorida.dk/operatori/userfiles/file/tonirirasogedoraje.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/mupazufubanazowodekoda.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9fe443f1d0010abd26e79da67574be6b/66585739763.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4f5fadb5160d258d60eb98b237569ed1/momaxotokadopozexuxa.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/61926270445.pdf
    • https://educhina.mn/editor/files/26790271775.pdf
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/pavagexusizudu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+turn+off+lock+screen+on+android
    • 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_off0000bc5a.bin
ce174a115a57f5609fcd0df64611f5cdc0f748a8852d4950735f1eba7fb1acd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5A 10740 bytes
font_01_sfnt_off0000d532.bin
128178ab7f2fdafb1c63d202674b9caf94a7b0fc379ff5a2fbd9793916bf9e97
pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 18920 bytes
font_02_sfnt_off0001062e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 16792 bytes