Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea509dcfb51799c5…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 14:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b34afcea7a86d60097af382a6ce287bd SHA-1: 45031027ef30296ab1e5d63fbf1ff9c01eb60450 SHA-256: ea509dcfb51799c58bfd26c7fdeeb7beedb49a39fb3370b8715287337a7d9beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Static analysis revealed that the document functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or appear to be disposable hosting. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.urbanwaterways.info/files/mazobotubatalebuvijat.pdf In PDF document text
    • http://ricarda-allegra.de/userfiles/file/97467770470.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/24533163239.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43cdf140c---wupuwamumupanawujokite.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28af91901bc870f7ec3da805e89ca167/74321666642.pdfIn PDF document text
    • https://unosms.us/userfiles/file/46255215706.pdfIn PDF document text
    • http://web68s.com/upload/files/xodupatijasiwomu.pdfIn PDF document text
    • http://beateromer.com/bilder/file/54665573015.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/64nfp20s8doppsmfr02prhnme9/4637582077.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/97761794953.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/54667287814.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/wiwamukepoxezidopolebal.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ad25560cde41ea834b686cc63c9207dc/nugodibalimib.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/batik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=oc+tv+show+theme+songPDF link annotation
    • 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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 17104 bytes
SHA-256: 594d5639718ed61c8a10a93ee274d5bb2a50494005c86f9b3e3627f6adb72883
font_02_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 10456 bytes
SHA-256: 11facd3f0c1e7ebfcba99e9b3fa1eb94db663f13d5ccb011268a32c7328f6d04

Open this report in the interactive analyzer, or submit your own file for analysis.