Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64e63505dbd4352…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 16:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 17ad62ec374d0f350dc93e86b62a90cf SHA-1: cd4158de962e28a416c9190760cadc5eb41327a2 SHA-256: c64e63505dbd43520665e33224c5fddc7270fd1c0498c176eae717a580eef139
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=1945+air+force+mod+apk+unlimited+money PDF link annotation
    • https://radiosmile.hu/upload/file/vapifivodi.pdfIn PDF document text
    • http://chapelguild.com/images/usr/10589130415.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/jekoxobi.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/tusogotoneteboko.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631898254.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/27472561146.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/8546604555.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/21092230141.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/rubonumolo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gesikaziwifabupiguvowelag.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/valojobema.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/vuvaz.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0dcb88522---20012204613.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/41697058f060f50d50c1ceed5c2d3d83/51256832603.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145749c71683---femoderus.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/relatezasejexateda.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/38802141500.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/20803473197.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/buwajetaluwozolisojim.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nodip.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/joselefebeni.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tebifokaniramipevakos.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/32590207162.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/18208379876.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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 18372 bytes
SHA-256: 1fcd33c1b8ac09000f413cb0a9446c2f59999b2599edf02de495a0cbc2fd5836
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 11256 bytes
SHA-256: 8a0d95512ae26421013731fa2a10379b596bebb062860b3ec5efbf58c879eecc