Malicious PDF — malware analysis report

Static analysis result for SHA-256 63638818bb572dc6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 11:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 54979ce3d35253a58284cf4bf3d4601b SHA-1: 7323fc9df35508d9226b43a3a3b3e186391e936b SHA-256: 63638818bb572dc6f3dc1885f0543a63f4353ae7ea0f6ea2b0ba048ee3250d10
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/95363244916.pdf In PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/38087852882.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ccdf4fdb11b42d15587a91ac205f2286/10542016960.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/zoduwowiporefemeduva.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/musomezupaberirituta.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6c2852e3c32fe1216bb833caaf9dd04b/sufotoregagotiraged.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/banixadufelalujakebeg.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-13/images/files/kotamemuniwuru.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f165cc8291---resefofaweribatipuj.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/393afe50c5e68b4e39d1be29be372dd5/58009948358.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6e4c77f1---jurukuwubitesomi.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/88619811487.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/fowopazerogodawisegis.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c8d038df---77659697557.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9f7091d2---fofesefidelomaru.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-2/20210802230036446430.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609263d730b37---vesutaxakojetugubudag.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/68942798614.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596783fa97---27296844831.pdfIn PDF document text
    • https://foulardfotografando.it/file/tejoremujujoki.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210710_3CA5914DB9F84FA0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=plinth+and+paramount+english+grammar+book+pdfPDF 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_off0000b96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 18620 bytes
SHA-256: 1dc080b9d591def3fdc57c8c0942e5ada0a0359a0f8bb46f2dec059572fd6a0b
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 11276 bytes
SHA-256: 3e9a33c360fd60ae2af8495806ec40a2691d21f3b0817dcc320c8d525418ec65

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