Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d7571d244c1e6f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-21 16:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e5cc5bbdad9e02a06be469a113531fd SHA-1: b0097d8af0007384bc9b686b9a90b80dc2767a40 SHA-256: 58d7571d244c1e6faa0cc80494446b7853c012ba6b38d596237eebdd91a9933f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that redirect to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be directing users to external, potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=one+night+in+miami+123movies PDF link annotation
    • http://rungruangsteel.com/public/upload/userfiles/files/27883508829.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/69132961711.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/39189786409.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136295397f2d---zewabud.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/4111995400.pdfIn PDF document text
    • https://penzion-palice.cz/content/22308944569.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ijnvk7jcidkip8b80emdtk7tb4/62865111384.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/65630628908.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nomerujo.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/sajokagebiwebovonepap.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482e7e8258c---25085789331.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614657aeac669---fuwosezizatemir.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/28828966097.pdfIn PDF document text
    • http://agama-rc.com/upload/files/76928151413.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/91615631592.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/tefumuzexekijeto.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/847a75e0bf2280d5db947b7e963e34b3/79390826257.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/lasisukuvixidoz.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/kifotoxebi.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/vurozuxo.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/1417917533.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/nanusawoje.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/99689564292.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b1b694d7---13961176416.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/sinikawanom.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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 18652 bytes
SHA-256: abf87acab923e3503a4c2d5daff9998586bd8c02270586cec78f30e8cdc40c04
font_01_sfnt_off0001187e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 10844 bytes
SHA-256: 3f2ccc57a27b90700c76c0c84f5f65385592fe762fcc0436e9a996afdcfd5b73