Malicious PDF — malware analysis report

Static analysis result for SHA-256 9776bbc77f3bd651…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 02:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 820cccbbae85734f0841dbaab0e6475a SHA-1: c8c8d929ad0be1b26f3c9c7f508799bb9e3a1773 SHA-256: 9776bbc77f3bd651a472b445dd664268d6dcbd7fd90eaf6fccce4b8f40f2909b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=free+diamond+app+apk PDF link annotation
    • https://dorfadvertising.com/ckfinder/userfiles/files/41263970856.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/sikekarugamoj.pdfIn PDF document text
    • http://fnathservices.com/upload/file/22942003250.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/40770029686.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/kizuvuvifimibesuziwe.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/83450662429.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b414c9e250e6ed84e50ce82f6fc196e9/notowopedu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27289882a---86050371795.pdfIn PDF document text
    • https://svltv.in/userfiles/files/34361424163.pdfIn PDF document text
    • https://ibextrail.com/editor-images/32746683455.pdfIn PDF document text
    • http://ternovykh.ru/content/file/29114146293.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/68997071101.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/tiwozilev.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/paxaxuvekiwabanasami.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/28086106470.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/lidorixuxapolubapuzi.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/74033098354.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909062428.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/bawujolupixuluwutaki.pdfIn PDF document text
    • http://scpt.it/userfiles/files/49755229992.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/kafemisen.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c8a72c4098dd19f0f1de9f140116cb63/19758063802.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/puromojamidudobige.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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 10308 bytes
SHA-256: 579afef9bd67b5997cfc002aae12c226d930f3f289405fb4843f3adb26965a69
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 18036 bytes
SHA-256: a8492abd8ffbd35755077f77d549631d37a49e8a54f927dfdb99d782938f9361
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1