Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff717c905f418660…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 09:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a21a17d83504b872ea57a29fed42ac3 SHA-1: f37bd34a2acf15672d1da3c4c7953257b2b902b5 SHA-256: ff717c905f418660fb7e61897214f4b6ceae45ae9a1d426a7dbbbd7827e7cbe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, disguised as a loan contract form. The primary goal appears to be luring victims to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yishiweb.com/upfiles/files/20210618_181522.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/731ed5d8157de2d6ead166e966043de8/27076511767.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/lirisusafugiwebinonok.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a865c189270---84618868149.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/97326636352.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/290711063892.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/vo20tjqbak1g91c51r35m11igj/30529988742.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/65953682724.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/sofefidikipizekabunobakev.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/35872843357.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/lejekagavujuxebanon.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/topup.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/zalifiguzobaxorepupudud.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/36655991153.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/22495493767.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/28187861661.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zakifokokon.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/bcpbv2fbpt7gvidvaql3hnl9uu/77622347999.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/bixawevowuzanodarurax.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607359d6ebced---bepivatugi.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37582560446.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/wileraji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=loan+contract+form+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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 17236 bytes
SHA-256: 0fb77cc889936836cbc431b1409968f84b9eacac1242e14512cdb52c8b659381
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 10300 bytes
SHA-256: 09f0962cb022b9d4e06c6bff2694597d561940f218693a70212a6925a904df46

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