Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fadc298437cf897…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 19:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91681c9787d54e245129544e2992f61b SHA-1: bd3f42ff48a5df4b693baa0cab533ec91ec79097 SHA-256: 7fadc298437cf8977999542a9de1c5f29d8ef53ad86d12a94531b89645b0f0c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=vpn+settings+for+android+in+india PDF link annotation
    • http://guss-ex.de/uploads/fck/file/86173364677.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/pexinifanuzepawu.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/welinoweba.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332a7c992dd---bamevajitukof.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/zubafepurazatajevituta.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/baluvazurib.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132569b23299---84023369569.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/toxolizegodali.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae8d72310195dde26c768c1f444ea193/miwitedubijuwixidewep.pdfIn PDF document text
    • http://newworldss.com/uploads/file/lavuzejiwaxijuroruwazaru.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/40322804096.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/59252404125.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c122d96dd---96612272106.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8600758243.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/molonukaxub.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vdrf1s3nttt38lfhqq7ft7ivlr/verenojufazobaluborilefi.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/38002389323.pdfIn PDF document text
    • https://bachson.net/upload/file/zirojobaxef.pdfIn PDF document text
    • http://pk.mo/userfiles/file/kopalaka.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910045905.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jopaniwatafidap.pdfIn PDF document text
    • http://runo34.ru/attachments/file/tuxatulajodowaxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4acda6a5---taxomegabiw.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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 18696 bytes
SHA-256: f3463f3ea24ec1089007060a41873323e354b53f6ea79995754532e786d97f8a
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 10596 bytes
SHA-256: 71b4c2d956a0123635d9ea8ccc47974ba4b063f0d84047d6f29f9fb264002874
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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