Malicious PDF — malware analysis report

Static analysis result for SHA-256 601fdd57a6fe9cb4…

MALICIOUS

PDF

75.1 KB Created: 2021-06-28 22:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: db80e18dc988af17eef4f045d1acf0c0 SHA-1: d4c9bee0e7e5a4c85fdd06c1beca74697f5fcdf1 SHA-256: 601fdd57a6fe9cb469f92ba3391c95371b138d3cc148b496147311f2a687c2cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=fry%27s+second+100+words+pdf PDF link annotation
    • http://reicar.dk/userfiles/file/gazizixifuxanadel.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf75669346---dotedetutadedososib.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///daronipogitijusasi.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a865f93107f---danedopilizirok.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///fuvofujosanuji.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/84523757685.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/64178216689.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d288e5c486c2f8d09eacaf73a46bd49a/6158471334.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e63ee8b7---97874013653.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ce7d1220---53759514837.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/82553258a8fb9c590dbb7f1affd12454/50635697089.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ec2b554f1d7b0028f86fb76a25111924/tewawesokefutekir.pdfIn PDF document text
    • https://nada70.org/userfiles/file/63847774106.pdfIn PDF document text
    • http://afro-safari.com/upload/files/62186751076.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609828130e4e2---83651257655.pdfIn PDF document text
    • http://chongros.com/userData/board/file/warugatu.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/monivilalewukoxijezufipuk.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kakuxipixisu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tobimupumatogorida.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ea5edc9f9f3ed0705390637ce538dbb5/57803555981.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c920ccae7f9---25020729856.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a420a1d63b4---86002741470.pdfIn PDF document text
    • http://daydala.com/userfiles/file/93597169330.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_off0000c26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16496 bytes
SHA-256: 59b2357d8438df5bd3dd6a998ed0f0f30f5fca75aa7c506685497f97837fa599
font_02_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 10600 bytes
SHA-256: fee95aff673002239867c369b9992dd720c0bdbbcbf919bb302c0e66f34de542

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