Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb940af9b06e8467…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 19:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac4926e11f10bb1882a812ae26b0830d SHA-1: 6c9a61bc01231673902788a1377b0ba49a45f968 SHA-256: fb940af9b06e8467f21ba83b9e3d4a907540837e960b28454d0a37b00369bdac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm. The presence of external URIs and a link farm on disposable hosting indicates an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161294f7fc1302---84529170691.pdf In PDF document text
    • http://3q1p.com/upload/file/210731180359761001fbsu0ofgggow.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/13a515d41fcd83b5aabc85574cb142d9/duxasevotuwagadetize.pdfIn PDF document text
    • http://coachhouse.info/assets/file/zigalumipab.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/49118796469.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/zerazibadibitoruwufu.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/wilomiru.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/90062058461.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/1282627632.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1ihlg83np6ht6tqcqfrfbvfh7o/58212530459.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c1ee54bcaf9d8e9c6535c7754cde9310/gamokenanazukanag.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081939404145---34937941546.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/nagadakitiwoguwabojub.pdfIn PDF document text
    • http://indemo.pl/Image/files/55950581630.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610aaa40c8f57---vobotesawulogipusev.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/jivijadesofedoze.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/zinutabuvenasuvufobabeki.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/92287962736.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/nitalogop.pdfIn PDF document text
    • https://membermimpi.com/contents/files/19633678410.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/xufoliminapixidelapeliked.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/aunv0f201eduj23f4m8m0gudns/relijodikiwabeselazozig.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/42708783521.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fc8f92f095f0cdb28ed6c9a9ede9d376/48896123711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=foucault+power+knowledge+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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 18740 bytes
SHA-256: 1e797c8ea3263744f5c973267d8e4f14f3f54ca0d821b7e4c0a687db2b437747
font_01_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 10792 bytes
SHA-256: ab56b9cfb64f9d2597c2f52c3f1ff22d9d1da7e48fd18beb014bf074cb375884

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