Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69bf9336010f52b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 12:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2f824e188de83f87f2f76a5d444ad27 SHA-1: c3d21d787d71598da56f78aa12ba00ebeff258df SHA-256: a69bf9336010f52b968b5abfb32d26950634554f5d597ef2cd462f9ec92d0fd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=aplikasi+download+game+android+di+pc PDF link annotation
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/27263178936.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/xelafusuruk.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/jogolobutabigadusom.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/sutodax.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/lijifewife.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-14/images/files/posogejipigu.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/lenekuwefigo.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/40515352362.pdfIn PDF document text
    • https://laps.pl/userfiles/file/fufemadasivilaso.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/defapixeno.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613ff1dd4faca.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/35130412946.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/5351799605.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/79689298739.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210909_541A5318A5B48C5D.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/24634592147.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/55757219882.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/tufesigo.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/nidamudazi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tk78lbll01fgl30fbpoo81c8u3/rogegozibaziparajixup.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a048e1115d---nibofolonodogexitazi.pdfIn PDF document text
    • http://attlas.center/userfiles/file/jivuxafedodefakosasato.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2h1nicknmrad5de3t9pd21jeos/94177487297.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/timafozixixezesatiw.pdfIn PDF document text
    • 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_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 10920 bytes
SHA-256: f6e4298e7c537dff0935d206191e56d4783e8a68947155cefc21309050f68c81
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 17460 bytes
SHA-256: a324c6c5ebaaf74f45950df6ede6dd9792fb0b28db7b0ee3a2d80039b7f652b6
font_02_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1