Malicious PDF — malware analysis report

Static analysis result for SHA-256 efad7fe9a14761e7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 03:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 64d106fb2bd3a20218d3dbafff3f3b69 SHA-1: 15f93961664d6020ad8c41b2026d04958964c0da SHA-256: efad7fe9a14761e7b61c3a504d5a624476c7451e7cf46ca78906b75f66f0ec66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings point towards a phishing or malware distribution scheme.

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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136782a19054---xotutij.pdf In PDF document text
    • http://elektromig.pl/userfiles/file/gumugifopukifoxevuz.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/48682853246.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/lilevupetelo.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/86106638506.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/naborujif.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/72979002871.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/80522427033.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/kujedukumaguzuneb.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/mifolakurebumujevifuxe.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/zoxuperebam.pdfIn PDF document text
    • http://www.og2c.com/images/file/81164370200.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/5214352920.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630859041.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/teferisusakijomerawepiki.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/bumekipujanufabofovinifa.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/77094450745.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/abb4378550938e332d2df111df92bc21/gemora.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/tuzufa.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/94956852226.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/51618472143.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131f185442cb---lalawixuzuxoverawexibo.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/bizusapajimako.pdfIn PDF document text
    • https://arerp.kr/data/file///86090580478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+complete+dlab+study+guide+pdfPDF 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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 11180 bytes
SHA-256: b4c34dbb286c0262128d22985f5c307464ca82038ec0fd8a13b023fa0e6ab339
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 17860 bytes
SHA-256: 5694186803fce418b2a425cdb8c4c1bc3a73d0fbbdfef719adcafa47560cc75c
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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