Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b60f9834de2617…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 21:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9afc5cd3abf41756d7d48cb0ed5bf7a4 SHA-1: ae8fdd65cdf20f4eb1c7fcf83fe9a1c13bdad052 SHA-256: b2b60f9834de2617c0ed3e6440ac2c3da11af111da8ffbbdce24f0a22269e8fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing or trojan PDF. The presence of a link farm on disposable hosting and a URL with a 'utm_term' parameter suggests a phishing or spam campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=what+is+cached+data+on+my+tablet PDF link annotation
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/42980582087.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/84848661606.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a85991dab---bijuworowa.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/savidabad.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/silowisifofejamabon.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/16323098155.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/56503526213.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/rozab.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bbf67fad8---54371714557.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/47627834762.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/botoviver.pdfIn PDF document text
    • https://12shio3.com/contents/files/26606767565.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/89856511066.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/najizovokebigozilibexuk.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/kenez.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614215a3423a9---jafoziferurujelolu.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/dafagoputas.pdfIn PDF document text
    • http://taociren.com/upload/file/210915073409953127z4dnufz0gr1l.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c5e0f459fc51517d4eff35748c317f1c/fugatiwimoxapagine.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/30405087457.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jomigi.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_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 19344 bytes
SHA-256: 1a68d687e383be1ee1849754eb01c685e2ef8c639af35ff15435e3eb82829d47
font_02_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 10780 bytes
SHA-256: b123546a828f15c83851f04028377a15ae8d53ea675e7f1bb39d1e1deaf2c7c1