Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ddd370b1111a57…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 23:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7a4850229b7e3a35eb72ed99cdc3c6f SHA-1: f5f0f8e0a075a19eccfa1d73643c7082601e9cc9 SHA-256: f3ddd370b1111a57ae11b221eb83116b552339d4c1cd4518194c86577dca4f31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, suggesting a phishing or SEO manipulation attempt. The presence of embedded JavaScript, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The document likely serves to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=what+is+the+best+gun+in+call+of+duty+mobile PDF link annotation
    • http://baltyk.recykling-rejs.pl/imgturysta/files/gutasosifus.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/robipuwotozudosege.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/bopigujiwiwuguwujuju.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/16371943191.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/loxofujifatasotilokufinu.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/39541043129.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/wuwugaxovapufize.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/pokoxowamidagaw.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/ropuxus.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/kelirukomezebamo.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/vawikirabufed.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6f907044---79927788893.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/35550861178.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/dugofateruvusowinibomufo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5865a0222---tunutid.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/verutolefadosobu.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/gobadurorukam.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/kudeji.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/47be2e84e0df71f292d4def01610a058/31493628275.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/ginikujorafonixu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134614d23841---77646928079.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/50346623486.pdfIn PDF document text
    • http://afslab.asia/upload/files/2118467997.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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 11172 bytes
SHA-256: a5bc8503d060c6f550bed0b3b116b039c6bbbd2e8ddd4c105bcd6515b96f6dd9
font_02_sfnt_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 16964 bytes
SHA-256: f0eeae8676706fade0adc995e14d882e35d1ffd972137135f138e7eeea6863d8

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