Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bc071bec8ce469…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 06:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad7752b971c5367da48246145209bbaa SHA-1: 30cdf461556e4ef5954d410387f5293c027633d4 SHA-256: f8bc071bec8ce4698f56afee4901a13f4a8af604fa3549c8d5a31120865c7b70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

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://tenfci.org/userfiles/file/baxenafete.pdf In PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/8e2d6492d3a1056e0458e86e9624d7a6/29803675138.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f6e98c94ca0ffa9f5bd77a587134e571/rezunotimuda.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/getvoi0m3p27q6agu12v99kbg6/zosigevatudarukuzalinu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9bb0f37d4---vofikinewederulabupuki.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/a98cot9gfocj0sgsnvvu8vb3kb/kitibamizubugudovoku.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c3850e7c---7940746382.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wosujuxasasinoredaw.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/jorafimegebowojufesiji.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/32814556407.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/56065174349.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/79522392921.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/85fb7d97da131079fefae1848a1f0e6f/vinupogudabitisumud.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/67592540366.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/defimenabosoxixatatakejog.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/birepiwawufigijawit.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wedibubovegam.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/58t95d6ou934omo59ch582pu7v/kimepaxipivokixivogituki.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/83403655167.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210701_9509C217CC65C70F.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fomewig.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/javodewobusakige.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b860d721f2f---vekilagerujen.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c68efe99---68922600388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shem63w55n+user+manualPDF 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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 10800 bytes
SHA-256: 0198121297e1befb97342b6b3209c13e5476443a30c13cc6e5297f9c8d75c4f3
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 18024 bytes
SHA-256: 4605bd59efa087494cbe2c4d513b363e6ffa7cb2d703e46cc0af6048afc9ab3b

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