Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32d3fbc53ec0e1a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 09:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5674d7fa5cda733fec7ea6d5ab5b016 SHA-1: a08e865f996791b6c5c736aba2d6b8c74fbbbf40 SHA-256: a32d3fbc53ec0e1a8fd4c5d31230d78447b9047fcdfe24af1185d2cc1e6d72a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting it functions as a lure for phishing or to download further payloads. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.jobsincrete.gr/images/_user_na/file/wevufolaruwupumetixuvube.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad788ea29dc---rasudijugopivusulepedil.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/zarev.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/joxozujegig.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xesozowutur.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/11575594723.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/32480884239.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/3427663970.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43870068275.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/vokuretafanakigewu.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1laqhigjbikvb6s6i9if617d33/nuxozumuwosumakusipana.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204782120fc---buzebe.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/diwukavaxowisodetif.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/nrjl83dsouku3heq54i1srd9jq/88875325053.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/xijibofuruxaka.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/35487508056.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/59361650251.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/komibet.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/tubevajikowejuroxifisa.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/18586073107.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607579319e2ec---5047719087.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb50b11ae---xuwevosuwuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=nda+2016+question+paper+with+solution+pdf+downloadPDF 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_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 17516 bytes
SHA-256: c567135c1a1bb1a977bab9834c1eed346ae08bcccf97cb540585658ae643eed5
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 11364 bytes
SHA-256: 5ba7dc839c046f6c55093466c7da0c134037ce6366d0ee24c9e3d0f08413efad
font_02_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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