Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab32e17ff050c00d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 17:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16c004dbea90b271633c331a2dbda81c SHA-1: 2fd66c53bad9bf17bb79521b8250464ab5403331 SHA-256: ab32e17ff050c00ddfaff9a9838960777b22dccd6982403b9720da6c029d7b9e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristics indicate the PDF is part of a link farm pointing to compromised CMS uploads, suggesting it's used for phishing or malware distribution. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://catamma.ru/uplcv?utm_term=3+letter+words+starting+a PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613076d74f023---pujil.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/78894189120.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/8999859863.pdfIn PDF document text
    • http://duef.ru/public/file/mupox.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/gidamiwo.pdfIn PDF document text
    • http://eternoohydro.com/d/files/faxoxapafanitetada.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/renizizimo.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/57801266483.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/25870732776.pdfIn PDF document text
    • https://capecoralliving.com/media/file/tamoterajebuxu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210916221021.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/gakegujesovirexowosuzag.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/fonenowebolipu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/zovemegusomifedewi.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/4318173190.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109170151164759.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/wufawuzedejim.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ae3b18d1---barigaxifisuxixuvexivazix.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/81966844009.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/33818553607.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/cebce9a6bbb62de4982270816d0470e5/89566847079.pdfIn PDF document text
    • http://packamate.com/userfiles/koledejuzibodewosigawugit.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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 10584 bytes
SHA-256: d0a15d983cdeee4cb79eba1209e7686df149d01422f28a6d45854523dcfcba5c
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 17976 bytes
SHA-256: ac268c7f463b48ec8951b0b580545da1ebc47c67cbde4e8595ef07cb51022646