Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d4f3294e2035b5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 14:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3eb37f37ca1a85f6ebab6ffee8ee9331 SHA-1: df94b31a6a8bcac4e94c1695df1fd27a850f46f6 SHA-256: 75d4f3294e2035b50fcc1c118b0e9c3e4b1ff035c2a997e164706f825141f735
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm heuristics suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16144ffb1ce121---73740616167.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161412e2b96a7c---pixew.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614315cd84969---84440695340.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zomesunujoxulanibuwela.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/15207b74cad6a3d2590a79199533045d/80889638144.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4183bb7e3d0ae3e0ca3ff353bb14cde9/nubanaw.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/915986901.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/buxetalexu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/1101212440.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/70755028026.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/84147436697.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/37941768010.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/10836283194.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/32504515542.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/39158482500.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/resetogopetulepiwamuv.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/83285755042.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/jefelijemawuxozuxilo.pdfIn PDF document text
    • https://telenovella-bg.com/files/pisafafirumu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313c220fbb3---49776066440.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/69351767331.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/88a81de56da653ca2ccf0abe09e5b83e/javinosoxuxovalobuna.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613229515e84a---zeforab.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/71481439459.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/15770468014.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/16543008829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+secret+bride+ep+1+eng+sub+dramacoolPDF 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_off0000b729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 11256 bytes
SHA-256: ddbe4a0086263305a295df9c76256175fde75addea8afb410e981c23e8b49abe
font_02_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 15684 bytes
SHA-256: 83c6389b0cdcf9435690a8e238ae3cf6ae65dffefc967cef2cc4ec4eb823f6f4

Open this report in the interactive analyzer, or submit your own file for analysis.