Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbbd9fdba8bfbcc…

MALICIOUS

PDF

83.9 KB Created: 2021-07-15 20:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa360803f121fdd7e0d9ee1ff6e1d7ab SHA-1: 22cc7b22309113a1e2c3fc9c2d9dbe6b5015145b SHA-256: 5dbbd9fdba8bfbccec1088373343b4b64c6ff2b4e1ffd6b46b2887ec2cb415a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be287b24fa---vezafaxadupuxexub.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d68273788---1942745474.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/qd2l1rfocrrk3glfik39tar1qh/34350415150.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/ruxoratab.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/zuvalatudutufuwetezagop.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/54542060954.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021781110113798.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/89972262904.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-25/20210525183825696753.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a316ee9128c---metone.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef075472d---47302148484.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/bofiru.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/46023229159.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/xijolal.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e784cb26---mepizamagavexaten.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c220bc4fe7---galosotefamapemobeli.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ce9d068ae58e3907b220d6b37b416cc0/rejijew.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/56217370113.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/98088783450.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a430019d---daditememez.pdfIn PDF document text
    • https://gangnampools.com/contents//files/tetin.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bec45f15d---41142832818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+20+kg+to+poundsPDF 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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 16708 bytes
SHA-256: 79a106e3f94dbe27ef1639927a0cb820b632d56b7470ccf56326dcdf1d988cdd
font_01_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 10796 bytes
SHA-256: 413d946b8c693e316f5837666585873b28a4a5fcc4c59f516f5b2008fed458e5
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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