Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f851c36ad165a9…

MALICIOUS

PDF

89.2 KB Created: 2021-08-08 21:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 650c695d58e62911fa3455a8aaa7cd16 SHA-1: 763049d849057db42997ddb4a333fba627e69b19 SHA-256: 66f851c36ad165a9d764c1166bb19f115a5ebb322ceafc789d6903b06dc4390b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3b556eba---92097622552.pdf In PDF document text
    • http://aven.su/userfiles/file/ximoviriwil.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608593b8892fe---22773311470.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/15445545477.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/bagimemuve.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1627319926.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/wajekoxisopoko.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2paqrtu27mtslq0hlbm5t6cf73/tivaxolumewimujozuvudaruw.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/40330262607.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/31146442556.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/56442147377.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b488523d5---zugad.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/10821239061.pdfIn PDF document text
    • http://zerosquareonline.com/file/32551805273.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/6637021252.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69431909681.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/95907275507.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/56042366427.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/venogibomusamitopu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/76522505337.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/42e12682555bdef7c7579f678ac5f658/rovaja.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/juxifozofuvexagixopuf.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/zagilinejawosigedutibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=numa+numa+2+mp3+free+download+320kbpsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 2872 bytes
SHA-256: 2523cbf8fd55c71a95c4cf1b5bcc94b189681be1147095e9232fd10df1b5a01a
font_02_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 11276 bytes
SHA-256: ded27e6b2eb6822a51200f04c1f18ee7beaa7601b489197aa357710725fe83a9
font_03_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 22636 bytes
SHA-256: 5ef31beda5155c2e20675569a5f4cf8e8678695387bcb4b3902bbc0c847da52e

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