Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ef98245f5a2016…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 16:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ac4b7f5271567b43236d7b81d68138fe SHA-1: 4c84fc439cc6d8808754c5b3425f4622598d80bd SHA-256: 30ef98245f5a20161d1d7783bbf6fe5053650d95542d59dffc27bb268ea99e22
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary attack pattern involves luring users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=how+do+you+update+my+phone PDF link annotation
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/towuba.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/wabolovokutixerul.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/semidokowurefij.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109051115426282.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/wafaxusu.pdfIn PDF document text
    • https://aokman-drive.com/d/files/karizopomu.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/mipazokazaladokifaxap.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/dakibiw.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131980f058f9---10272771850.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/xiwifaladopepajodedoris.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/21932400710.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/11248987104.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/83017864536.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7a2109e75772ddbbd1608cfbe49d761/safamojureru.pdfIn PDF document text
    • http://netflor.pl/upload/File/dubewised.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/85224011203.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gonuwifuxazolol.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/jabumupa.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/nidefisogojudopopizubep.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109151426417559.pdfIn PDF document text
    • https://ptogel2.com/contents/files/74534016457.pdfIn PDF document text
    • http://hmed.vn/upload/files/davaku.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/milulilejarosa.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vosegenadupomoxak.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/50911343941.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a170cece3---41913702584.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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 17316 bytes
SHA-256: e25ef352a3dbf7a244f9eaa1088ad79e435563e9d830115ca8ae2e6055f036a2
font_02_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 10540 bytes
SHA-256: 58c88b9ce4e8e3f4438a8bb44d7c07c796800d91da29bd1b3ce286f19cfeffd6

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