Malicious PDF — malware analysis report

Static analysis result for SHA-256 733af0d4002f3345…

MALICIOUS

PDF

76.5 KB Created: 2021-08-02 05:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 124a486d29f5707f7a969157e84b4a3b SHA-1: a7ce8b11617a302b6f1502c042ad0c8019871340 SHA-256: 733af0d4002f3345b8f16cb9d39290f2f94c6d38df62fd6d18829b82dc64372e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pass-eco-energies.com/ckfinder/userfiles/files/17848439478.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4ca2c0592---17094220094.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8fbtikk8r2q8qcqoj7odgaapmb/23546340931.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ve90ch1opqufvi5qh6ae4foron/35519151812.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/sorexowodotofin.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6b11fecfc301ad02609c505aefc225c2/woposetupubowam.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/23317309633.pdfIn PDF document text
    • https://nada70.org/userfiles/file/xevogulivujefusovalonu.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/bubofakanurijo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n1kib3m68afi30b8ch35im41v3/xuvuperevi.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/1422d78ed9a68d56c233521c6a0a69d6/66486248222.pdfIn PDF document text
    • http://topstec.com/d/files/fugopokigozavanuluparofud.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8cf019ab5daeb4058b5e20052115b3ba/xuvodejobo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c566420e8---90807949626.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/vonurivefifowetajasuxuzos.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h3gdkaai0bfair360g6olbair4/dubimotebuzirulakapexu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/is7amk9h24b55g5th0vi3hhfl5/wopekimazaduziveleko.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/16/file/20210516_063217_164.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/80795826754.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/lolujesulupemonejorogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ellipse+worksheet+with+answers+pdfPDF link annotation
    • 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_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 16084 bytes
SHA-256: 28fda4485c151ed819f0e678c5371bf82d78107dcf77a873be0dd38487d086f4
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 10756 bytes
SHA-256: 116e0649a5d2fafc2cacf8c0fbf5c615939ad32cf2a40aaa0f54fcb63a19b48e

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