Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fddbf9abd776e4…

MALICIOUS

PDF

98.6 KB Created: 2021-07-14 03:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7155dd55765f6f03595c06b2d4644130 SHA-1: e5f461832e74cebeceb16d18b124d8a5983449f5 SHA-256: 24fddbf9abd776e44ffca4449a8cf8c6dfe4fe9a42c5887388c3f33426d49e0d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://smartpaintingplus.com/userfiles/files/25079311507.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c15d21e24c1f22eefb962497eb61592b/zewulazelasoluw.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609927e237c24---pagudepa.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/dimujulibiwelow.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/943443d24e981c7341ba8e99b6d3e949/1693855149.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a792a9c10099660f8b9e8508637f2b2d/pilatoganuxok.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/529826f638041697a10d9a9f7f896601/musimasonewobukamaliriv.pdf
    • http://wellfoto.cz/pictures/files/35357826363.pdf
    • http://waterreducer.cn/d/files/bufisadofiteromepawo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eeac75ff2---muvor.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf207ddd78c---4330506384.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfa0d049c---pobinerejajonotax.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096310a65b42---13202795595.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/43146054851.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/53285d17crnaci43bf49jom187/lifezinew.pdf
    • https://musikkursus.dk/userfiles/file/11657704724.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58dcac7a4760703b4a051ba05e04f334/wolitugowibebiwa.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f50f8d3d5---vijug.pdf
    • http://www.awakohchang.com/image/upload/File/7348622739.pdf
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/tevejekixevebo.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1cf2322d---zedizarugem.pdf
    • https://grancom.by/upload/docs/madewimadorovokupoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+spell+papi+in+spanish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f1.bin
efd8f755fd42e78cc762c7c04f2dbebf679b9e65d244be64f76344dc62fa8348
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 19476 bytes
font_01_sfnt_off00013648.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13648 16792 bytes
font_02_sfnt_off00014e5f.bin
eb7d4100c918e23f586eab81bfa00c6f9812c8ea81c87e13a6d9150621922358
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5F 10328 bytes
font_03_sfnt_off00016590.bin
b0905f735add9c35dcf0322ee6b1ccbe2abd99b3027b5dc40d6a2f077e8c886a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16590 16944 bytes