Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b0c7fdc98f377a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 20:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c71210bcefa02017496e32dd141c61d7 SHA-1: 63ff2f19a97a1cfcd386381d87809a8773115e0c SHA-256: e9b0c7fdc98f377a3fd3d88c2e9e70989967880d72416f6d6df3bf4b96a15c0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The ML classifier strongly flagged it as malicious, suggesting a phishing or malware distribution attempt via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/kejutipibituxe.pdf In PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/futuwujoju.pdfIn PDF document text
    • http://regmac.net/userfiles/files/238363586.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/xajuwomonotibivo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404ddfbfdf3---velexulifizix.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/50354436025.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/pogijelo.pdfIn PDF document text
    • http://hkalc.com/userfiles/92735542087.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613497c3d0f4b---57359853413.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/72891833125.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f395f02dd---wezoridovusemefamof.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/30081125315.pdfIn PDF document text
    • https://franchiseinnovations.org/broker-site/files/files/11422156152.pdfIn PDF document text
    • http://activsport.ro/userfiles/file/8390884847.pdfIn PDF document text
    • https://dyaa.club/uploads/file/55486649988.pdfIn PDF document text
    • http://maulich.vn/attachment/files/jumoweposokalodonax.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40740933733.pdfIn PDF document text
    • http://cutskytools.com/d/files/mewete.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/ginana.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/xorususawekezasola.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/98567002192.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109160519088918.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/29142725823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+boot+animation+locationPDF 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 18052 bytes
SHA-256: 75f67e1ca500ec4e8273bbdc8f55e7b8b0ffbc115e1b867b3f71debb04e93aeb
font_02_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 10352 bytes
SHA-256: dcdfb29454c6f2ef6eb7a4e58a152f85847bc019597b3a937bbf456992bbb2fa