Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b0d645301a2e6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 21:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce17bf1109caad18902696fdad12f0ff SHA-1: 7aa83f02b9f06479d6ea0dad14363cdfae206ea0 SHA-256: 8c1b0d645301a2e6ec998eae87a55be190aebb4b642e13d4f8159fd246b6c69f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/79609101e99b041c8fd4e122b59cfd4d/76828765555.pdf In PDF document text
    • http://smolninskayahotel.com/userfiles/file/8833588221.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/lawumobagadejebifiso.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/letuf.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kosafedurugeji.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/73211861975.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/47855105194.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ijvttf342rkg1e9fdurmh3lsj/gawimejejinotewogumaxarak.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/86555931096.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/89875417617.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/40242843903.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/51573284135.pdfIn PDF document text
    • http://autovoda.ru/upload/files/14869641218.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/5239403436.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomulen.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/mefar.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/solawulinurubizitobupele.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1d48423023e28f1ed83d10bf7eb16df3/25255295243.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/9c1bbb6696ce4b3df79b5f7ac07adf75/mazitidovidibin.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/pebovikaneb.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/47540894816.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161332071bdc0b---63532560412.pdfIn PDF document text
    • https://euchebnici.com/img/file/8985660252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+rfid+reader+source+codePDF 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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 17560 bytes
SHA-256: b8d57fac631d4d76d8aea16386b4808561ab1d2ca2c46ff135af4ad8aa4b593d
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 10408 bytes
SHA-256: 55f769dd391880c6ca15e87320997da79d46018e12fd815e87fc1ee853fbe751