Malicious PDF — malware analysis report

Static analysis result for SHA-256 9469f7635325e58d…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 01:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5d4b1c3dab86e77064867d5bbe7b86f SHA-1: 21ed74a105c95f2f1c191e17bf5cd6b920aef2fc SHA-256: 9469f7635325e58de9f48c494cb0e5b336e54c3f3a4c89d8aee606722d6f2c63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jarosi.hu/files/file/xajopewapamikidov.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/pnn307bn23tdkc5cvrojd7fq04/kobozajinorusilu.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/vuzimetazono.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3ea21e6c6939fe0bba2515922931576a/muxabapanegabito.pdf
    • http://libertyquad72.fr/userfiles/file/95965653024.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4514b8f43a---zazewameluxudalod.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/1dd336i90223n3e2dohjnja0dd/niteramokuvurapob.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c1bc08b7---sawip.pdf
    • http://daiichihr.com/uploads/news_file/sejoxefamefo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816f483fa96---gilubadonorefosaga.pdf
    • http://qiangka.com/ckfinder/userfiles/files/79197042734.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fa7dc332b24fbe188a502fb717de5822/10862240983.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/075a5977eac4410bd59cefabd614cc5d/puvoxajixatetasinimepani.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/17bgg3a9ql9pr2s0c4mjqv1m74/perajobifim.pdf
    • http://ahkjt.com/upfile/file/vupadanavawowapana.pdf
    • http://controldellaves.com/app/webroot/arxius/file/potejofidekibipufowisit.pdf
    • http://eraucheta.ru/uploads/file/wuminerafexekabowes.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f50e9272---40078015516.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/24275056632.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3579c851---25751167965.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/36102389966.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ba97893dd8456207c8af9f8f9e4679b1/76887938741.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9e0b6456c---64855697507.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=36+swg+to+mm
    • 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_off0000e9f0.bin
daa59d2a6d65108e4fa02cbc139503df964e3aaa48a44c014c49b3453f43332d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 16660 bytes
font_01_sfnt_off0001156a.bin
18e9d60df0bbc1ba1299bbd98deb7ff512e552d6e00f87bd99268345031c362d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156A 10144 bytes
font_02_sfnt_off00012c34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 16792 bytes