Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfe40ef0d05677c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 12:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c72d4baadc28e9586062d4792a6552c0 SHA-1: 2813b403fd7e1eca2566b75c2119205fc9ebc929 SHA-256: bcfe40ef0d05677c042c0688e7739c40ebc119d01e42a383b4daafacaacd2696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=raymond+chandler+the+long+goodbye+pdf PDF link annotation
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/9374567292.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/39558340414.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec7a11e22d7785a5f32564c77d46c4a2/vuzerodeworejapibuwibike.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/vumidik.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/budusozojusogoni.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/58098837878.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed11994fbd---xigifo.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/45316718473.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/56751858252.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/wopoj.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/katakelinedebaroti.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/41549128703.pdfIn PDF document text
    • http://salt17.com/userfiles/files/kininitid.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/13341200008.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac927800c0---zodawuj.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4547b0d4b---kawemenezogupaxazat.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/28748200310.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/27245324895.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/42540583568.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/nujavobopisewasuluju.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2f8a6161---regakidusiwitunoxigo.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/lagep.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/bezadumebo.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/jiguludejobesigijor.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/42229354685.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/92026122356.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_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 11104 bytes
SHA-256: 22b0ae37c0bf33074ce800785790cb0fa26536def90b2c4f8fb57a1878b258bf
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 17536 bytes
SHA-256: 7e71738f0f1bd282659dfc0d4f20a3649b019d630bb3df1b94ba8ff9794face5
font_02_sfnt_off00012b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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