Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfb746f7452afc3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 12:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7986fcbdd41ca7facc41f87ac5978cff SHA-1: 825545eb3c19f06c99637d57dd7d1f65acd78f13 SHA-256: 0dfb746f7452afc3371968e51926717abf206baa89d9de42ff7bd8e9fd0557bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a large number of external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://wastran.ru/uplcv?utm_term=operating+cash+flow+ratio+pdf PDF link annotation
    • http://remont-elektro.eu/archiv/file/wanibafunizulimo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b4315423---25806054529.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/17fe565b15b137ac47e5828228adff1e/japilerasokisir.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2c78sqa0c7m9p22rd0hm22hcn3/86518752381.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/30301439521.pdfIn PDF document text
    • http://canoeing.by/pics/files/tozevolar.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b733265e3---9912388740.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8c6d59242fd641f080057c5aa9316934/faduve.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/nakebetidi.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/40657824701.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210602_201620.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160cea59fb33ca---71014754069.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//39360095613.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b68f39b1ed---notuxejojobevab.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/guludifituwuxi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/jv0lj5p134qhdn5sga9n27q44d/xovepuwazidi.pdfIn PDF document text
    • http://jcpingie.be/public/files/96243094610.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/julageduzexuwenaxagutev.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a30fe886774---wonavapenap.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/wojapokagexotaxedunajavi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1256f1332---somoweki.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/biforuxojawuxejujonem.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/29862645065.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210801060502_0xs6rm.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/j6bta1mmpuf9oo0392elv837s0/69730297673.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/97540845610.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/lowebexekivasanuka.pdfIn PDF document text
    • 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_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 11008 bytes
SHA-256: cba86d7a69e29fe026f06094af2da4bae50257c20a41d29620771b5f9ced36ab
font_01_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 19044 bytes
SHA-256: bbcf16202d11b30f5a3922cca54c46e24f2bfb0eda26ba26ec4fc62c1caf48e7
font_02_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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