Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cb65be19d4d85b…

MALICIOUS

PDF

89.4 KB Created: 2021-07-16 09:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bbcc0362cc359ee2461cd0de4c0eb18 SHA-1: 49a66af98c51c0324fae254bc38f5f846bb796c4 SHA-256: 86cb65be19d4d85b884782a1c50ad850c476bbe284bb65c4666d9cee4fa70d8a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=linear+programming+mcq+with+answers
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654cd4b349---domalabeburefigusuda.pdf
    • http://www.contectrade.hu/fckfiles/file/sodizipoxokajavilupafez.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba146300261---7852534240.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2429ebb2---85658710685.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc4a34ed0---demovale.pdf
    • http://irk-yoga.ru/upload/files/28570458369.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lbgbmragmr4dpl1bjb39fntb30/komujilubetemiwiwetukusil.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b9fbbbc4b1b8017b4becb4ad8967a21d/45927692398.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad242364f---vibizolusod.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a533f722b8---3473974859.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/eud117mpshhvf0ti71r39bu69h/dezisofiwifodoxoti.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/32d89f0f763c8a6eac503f8bb1919dd0/65144855322.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6p7qviiura96498enk0vlujjas/92272609280.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64e84a6be0---53115414720.pdf
    • http://charivne.info/images/file/84964356230.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2hco4pajig1gv04sumhl0nk0k2/kafomev.pdf
    • http://designklasse.de/ckfinder/userfiles/files/44512696650.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/v8k9unmmp1ahouv1t2svi54lcl/lebudetivekegetexa.pdf
    • https://haysalon.com/public_html/userfiles/file/kerowexi.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/d7mav8bnf5pij82hhdc3d6oh58/35633809389.pdf
    • http://deepakbatteries.com/uploads/file/33976546271.pdf
    • http://unicaconsultoriarh.com/images/files/36851297018.pdf
    • http://newgrids.com/userfiles/file/tuvotogo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e5.bin
61e7d729a3d3219c60af0a2d06c5fac08843d8fb172613bca302e7acb7e75152
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 18012 bytes
font_01_sfnt_off0001274b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
font_02_sfnt_off00013f62.bin
e5e20305097ef68cf3a9837363c8fb920077084c911a753201e954f6ab662e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F62 10964 bytes