Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b44d57ffd77470a…

MALICIOUS

PDF

89.7 KB Created: 2021-09-12 17:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0153750696551dbf462e9c452c34edac SHA-1: 82aeaf3f723a3414768cd8969d97cec8f3dfa0b5 SHA-256: 8b44d57ffd77470a8716305f82b1dd274fda85adda910a72c82c153a261e7632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised websites or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly suggests malicious intent. The document likely serves as a lure to direct users to external sites for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.espace-hotelier.com/ckfinder/userfiles/files/kilabirujedafodakovu.pdf In PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/17956824475.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359d08bbc57---sivosonututume.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/10084364334.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/lafapowomutasowil.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/menubozilusibotines.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/32915297408.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/jokugaxoxofageponog.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd04242505---95897784927.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bomiregexira.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/99058800484.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/aor9uardff6bt9en4it38be3g7/76595625177.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/6387896804.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/xalasaporigesal.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/73601346233.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/59973668751.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/rupixagemegasufux.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/tivofonijati.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/12841154856.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/4831620025.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/59165530209.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/febejipesofa.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109100433171833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=spaceflight+simulator+1.4+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 11524 bytes
SHA-256: c2538ee5b42a6aba01e9fe5810c4f6265fdb84eac7e4c95c4f59ae59f09dc58c
font_02_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 23184 bytes
SHA-256: 0b652a2b06d592b12ed06f2c27b91fcdbdb7bfb82dfe65d1a1db56299d27a9f5

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