Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd2b816e5dbd93d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 00:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc0181cb4cfa77c5e2b997990d7d081c SHA-1: 4086423338080b6a794c65b9429fdd56fe7d00b4 SHA-256: 7fd2b816e5dbd93dded15a67061fc3f6377d2b8a557d73fedbfb862cf96f1b10
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 websites 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 distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://philabc.ru/uplcv?utm_term=kotlin+camera+permission PDF link annotation
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c332629c---29324120829.pdfIn PDF document text
    • https://pisausakti.com/contents/files/88985569657.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9c6398ecf9e0f488c6b84edf6db4ff6e/81235498340.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/23231847469.pdfIn PDF document text
    • https://kimcert.com/E/file/lakodadobinupovonun.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/29218861293.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/risibawuje.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/94721904220.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/tekufuxugafepinub.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/janufobizijub.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/832a14a0553112633727e71d47d70bda/84129352672.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1845282a---duguwegokamolagupevi.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/87668064413.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/fabezofemumapubeletoz.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/71687949456.pdfIn PDF document text
    • http://gewald.ru/content/Files/zilovuruviwebolafupu.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/97998100286.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce5974ac2---ropinewagewedataba.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9c7292e90---busofilazowezuduxaguduso.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/2863540284.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210902090001.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/94614798227.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/39607809649.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/fuzumadawanele.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 10524 bytes
SHA-256: 888e6a28414f7c348c91b6f187f369078fc23c6cf743572b83ea362688b86307
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 18912 bytes
SHA-256: 7c5497e8c4a5d92f1ce8db26b94c11f6517061f99d0aa3e7c76997a05819c704

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