Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d9e6b16c8c718b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 12:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c207d214893018b7a14d561381a3d23b SHA-1: 460c975f96b3be026a814d23af92fed0236c2121 SHA-256: c6d9e6b16c8c718b4fca7470727c2f31690c3c5883d4a3bd8d490886cb29169e
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous PDF links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sdhouse.info/ckfinder/userfiles/files/xurubozefawuwobefupegu.pdf In PDF document text
    • https://hizlipin.com/calisma2/files/uploads/devegusopogawiwutubudix.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/biwizepivugavobutisasetu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zesivonapijokunudoki.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/21940576866.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/76960033194.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pexajegojalamefi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161397d9e327c4---39662126933.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/33202135744.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/72875597615.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109052316248562454l1ugegnv5n7.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jizisusosewuduleno.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/sapifamedopoduvozafaxejos.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/foxelogokagagavonavo.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/70794726944.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/71473293268.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32af5aee5---latupepaxesewuragatutijes.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/74616755496.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/negosokiw.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/84dc59e59968a25a7c9aa0449e3feac3/5630663191.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354dc5c7672---vilatumolokajiwexirapuger.pdfIn PDF document text
    • http://grandfiltr.com/files/file/lemamaxizonijipoxum.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-9/20210909191835777364.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/4037974597.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/ziwubafewunobadejusudejon.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/87807740333.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pokefowetuxekizopi.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/95517674810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wifi+qr+code+scanner+androidPDF 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_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 17804 bytes
SHA-256: f592d03eb931e072de95c2139129b81b1663c58c0a87b03fef5728f6e22cdc72
font_01_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E4 10464 bytes
SHA-256: 793c19e099d72289f3d045871ad166d6a659a4f292117ad74da4cc34c916b388

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