Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4cdefd8e3d3677…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 17:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 614f5df272f0b4787b9297e320f8297c SHA-1: feeebeed5f67312dbeb620daebce80cc1355bf2f SHA-256: 7b4cdefd8e3d36776f9f707eb1061480008b2259aa96be76515655d7e891d95c
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the non-clustered link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rustproofingottawa.com/userfiles/file/warepeduxot.pdf In PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/74036784974.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/50958158013.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/galawutuxodegenutebisar.pdfIn PDF document text
    • https://banghenails.com/upload/file/79219046266.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613154b458684---wojazasowivimazatarar.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/70916286124.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365dec48e7---64398674248.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/7449359995.pdfIn PDF document text
    • http://christopherdallo.com/file/gajitemuwesosijizosu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e00913681---babexolefuvop.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/99682511916.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b84453ef84---kadetodifeb.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd40606d3b---zolafaf.pdfIn PDF document text
    • http://cochemical.com/upload/files/romekurixox.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/xasiwodolaratezik.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/21031432769.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091609145067.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/60883602076.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/60978929388.pdfIn PDF document text
    • https://invest.pl/userfiles/file/1709733223.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/23304906186.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/41450559339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=live+cricket+video+streaming+mobilePDF 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_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 10968 bytes
SHA-256: a14c633e060d9d17c8d98f02c91218cda864140616dfc05a47de2b8644e40d5c
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 17360 bytes
SHA-256: e4753025322b62bec752f3e70bddce7816f4f849fc32e8a501678c3b6aa15604
font_02_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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