Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e1c9e61079c1a3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 11:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d6ecd695f632869781b1aa76399e598 SHA-1: 50127c154bfa047dc2c17091b10b587a085d8a80 SHA-256: 84e1c9e61079c1a3e7f1079fc4c54f224571b4aa38d5f2cdb67be1466bd0a7f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kibunajcc.com/ckfinder/userfiles/files/fitixotinerexilijilex.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325707b6cf3---nusowabanav.pdf
    • https://latrinquette.com/upload/editor/file/31104847773.pdf
    • https://megatex.ua/images/uploads/file/62354898641.pdf
    • http://odpadykj.cz/UserFiles/File/ludugarefuvudezusaboduv.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c84a1abc7---xemamitud.pdf
    • http://razzledazzleevents.in/userfiles/file/jubarivifonovuvubi.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/kinovamej.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130bca161a54---welolojawatijoxukukiz.pdf
    • http://www.rupankar.com/fckimages/file/14918686846.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/30932395312.pdf
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/18838781988.pdf
    • http://rkmaster.ru/uploads/files/6420827254.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/4447764570.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/57238916356.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/galorilujaxufikixasi.pdf
    • https://kstraders.com/userfiles/file/18681357913.pdf
    • https://nevisnews.com/userfiles/vuzufewupabusutalunaz.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f095c88d4---7413084169.pdf
    • http://autoscuolauniversale.it/userfiles/files/29446481646.pdf
    • http://fandimnarodaku.cz/upload/file/sezutimimifodudo.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/loxuwukekokerujidiv.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/gojafivagexetujizatonake.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3387457f0c3861af7c0b0364e4f91aa3/romodege.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+alarm+silent
    • 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_off0000cf76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 16792 bytes
font_01_sfnt_off0000e788.bin
6885416e54bfa0f22583d20b508fd83e4bf4ab0873f6bf4025213d9a58cdd3b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 19940 bytes
font_02_sfnt_off00011bef.bin
0ea59adc54d53cdc67d5afd144d328a671b5c44197acc2392e6cb34d3cfc5dc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 10392 bytes