Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e7b87a0649176e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 08:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f1aa62f7b7c07ae00a146a830617597 SHA-1: abd38f62f5a61f570100e614439538fb765024b4 SHA-256: 84e7b87a0649176e0ec82d62d0394715f4cc5af053cdb45586465066b57d1f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or suspicious domains, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external links and the overall detection strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5129b42c909ef6a461b5d022afeea78e/ragenumoxadotafu.pdf In PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/wezitosonedozedunota.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133373bc5882---mavurebevufavo.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/63292403662.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da37a15416---19869329400.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270af88017---3700409192.pdfIn PDF document text
    • http://sun-eko.eu/files/file/jevamijavotukobekupanemi.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/56731955020.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/81005113068.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/45241555822.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/21920870649.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/fepomudotufujigamus.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/xoripowasunabekotajewe.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/53649357351.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/941247968.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/kineletobozegusosonanuna.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/86403785014.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/10568063788.pdfIn PDF document text
    • http://uco-kampen.com/media/files/25641727511.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/nizino.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/58341328377.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/13876851408.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/suxatapidavoxaguvipilod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=app+for+sharing+phone+screenPDF 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_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 10596 bytes
SHA-256: b384d3dea9df8d32f8d70f5b49334fe6b9f88e49102c2e4658de3dff8c5fe81b
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 18876 bytes
SHA-256: 7955e5f4dce83669778c0048aefe8c5efafd7d1590cb5de0f9cfaa22403b0fad

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