Malicious PDF — malware analysis report

Static analysis result for SHA-256 6694809a39a2897c…

MALICIOUS

PDF

90.8 KB Created: 2021-08-03 19:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aee8d415bd74e57be5d0971ed5ebeca SHA-1: 8b4e4f33b42f3b010d754f9022e3b1f17063f082 SHA-256: 6694809a39a2897c0eac14e067f445ec023e577abf94c77f7de8a62fe2cd936c
204 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coytex.net//ckfinder/userfiles/files/sudigi.pdf
    • http://safeabortionnepal.com/userfiles/file/febilakitafivodiku.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160717ebfae6a2---vujuwodalenamimutemim.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b8dad78b5f950decb6b79aaec500b01/45165413216.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ac1aaac6---13701950553.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j5697grk6cp2agmt3abkuu4phs/xazovizixalu.pdf
    • http://kochamsushi.pl/UserFiles/file/zobinubeg.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/dad312b13c840e28b027d92c5a6db274/87300547255.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/mcs40i65scgk4160on3cerarm2/metovurajudotixowana.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcd48871c---59204429838.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/25882722496.pdf
    • https://habibitours.com/ckfinder/userfiles/files/xadodenubutileridafa.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/96551517011f1a0a1dcc920e579693e3/nutavekajiwaj.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/87af04edf911b320f04c8ac91b6683a2/sobanidipivotazitoz.pdf
    • https://www.passion-rnd.com/upfile/files/2021/07/17/78510639392.pdf
    • http://project-lovcen.me/userfiles/file/navadesib.pdf
    • http://group-anons.ru/userfiles/files/20602743137.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/19001114561.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a7aae0953284aca362886bb493f6e11/43177196118.pdf
    • https://maintogelonline.info/contents//files/82679397106.pdf
    • http://akcjonariusz.com/UserFiles/file/39973154505.pdf
    • http://amadpich.com/userfiles/file/rixodujinevowogefuxomeru.pdf
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/tixolasavefakagumitazadaj.pdf
    • https://tatsolarlight.com/uploads/files/49779695079.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=product+key+windows+8.1+pro+32+bit+gratis
    • 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_off0000f9bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 16792 bytes
font_01_sfnt_off000111d6.bin
2954c105d11637a469b8d4a905947f887ce735ad7d5bfb94e0aee0aa847ab7a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 11792 bytes
font_02_sfnt_off00012dfd.bin
28d2e0a11c6887becbc3a56dfa2663ce6c24e026503b18623434685ad377b90d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 18096 bytes