Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56b4db4ad27bf7a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 04:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a625314440ffdad7d4d2546ed8a9168 SHA-1: 9f401ab89e8896cc3de26b83cc7ae8dcdd61e3c3 SHA-256: f56b4db4ad27bf7ae2941ada732178aec920622a05309cec3fcfaad12881b20d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=iphone+apps+apk PDF link annotation
    • http://mq-water.net/upload/2804043559.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cb81fb89---55829906877.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/99763168501.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/22165697347.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b40e4964---91742030639.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/zenumakanorazexus.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/38409623881.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613887dd3a63a---32592109314.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b94131c21a---28717095666.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/fusiret.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/92956198330.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146ac064f427---66398145509.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/bemobevazamawitemapa.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/58255624225.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/nadopezixeg.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/75477242886.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jorenojaguvazutizilomag.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/86865211415.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/10340769500.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d2ff0c76---nivumobubutijovin.pdfIn PDF document text
    • https://ptogel2.com/contents/files/dafonig.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/61507270334.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/pilagufisonep.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_off0000b2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C7 10056 bytes
SHA-256: 1dc41ff17a721006aa2df838b61d34cd9150a79593a2a1e3e836e3ae7570e194
font_01_sfnt_off0000c918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 18472 bytes
SHA-256: 9f0ac5387933b9cc10fdd52b043644df1b6dbfa19cf6b2c78f2ddb92e4b62bc9

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