Malicious PDF — malware analysis report

Static analysis result for SHA-256 07dbb025f28e0224…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 04:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c5892262e23f4a8bb33595ec32885f87 SHA-1: 404c7d0eaeb9f4589073298b8814a21cbee2edd9 SHA-256: 07dbb025f28e02240f37df4bd638933e11c1f5b4c639e4f5591f83daab45a1a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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 http://sity-luxe.ru/userfiles/file/24580967539.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b480a8ad---mawuzidizinikipoxevadopes.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/nevoxozifola.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1611d007dc6c7e---7361755991.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9f43e9ef---zilebibigavosanevikowujon.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vghlshvs542bv1eals3kfu0fm4/rejisakewerebenimatazowow.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/85163287524.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/96074978716.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/27894392683.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/40407421110.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/88c2e1a3773eb7b8eafefffa5c1962e0/zubagogupedugazebexe.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/24985175152.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/71045339542.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/14492881946.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161297bc17117a---87612318221.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/retelikirijinet.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/acf41b5a57b9bb6010c7003b5e95f6ef/retogukuzerevoxo.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/97198935495.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/40b34c7a2edfc7d618f6aa5cd7cff7a1/51109955053.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/wazexaworagotego.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106101235277783982klj9mdh9t4b.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/logovajufejalona.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/wokinusekusiborekur.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/90148277592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=capacitance+type+level+transmitter+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_off0000b980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 15836 bytes
SHA-256: 2a07dee4aff8f35d19527bfc885c0139deb4ae95500ff72fa939ef19cdbdc9f4
font_02_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10872 bytes
SHA-256: a0097434af6899bd60bd75d2628d28632a9ec66cb016240d5d246ecef99d9489

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