Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb75dc29e43be42…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 00:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a0a7d02695dd4d764639709d19d9f5e SHA-1: 8c0748ecb09bd8c866e7430cea752f79e545b59a SHA-256: 6bb75dc29e43be42a62c8c8e9018539dd76393c83a7ac3e6dc467292e0424a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rcp-ranstadt.us/files/wusimamurid.pdf In PDF document text
    • http://merklink.nl/site/data/ws/files/fesiwusedunixor.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/42260152823.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zadisufekaxalukezobipe.pdfIn PDF document text
    • http://hexindechem.com/upload/files/febagexepomusejopotetifen.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/22217731677.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/96498275013.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161438874a2e87---41773130349.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614656469569b---lizerozofuxusup.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/bikajo.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/wevamefelodimejimuk.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/40533642177.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33879484493.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/75693802005.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410fe0815d6---39798535819.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/xuwivimobakelonatijudedo.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/67907866930.pdfIn PDF document text
    • http://mastervin.ru/files/file/zelinojevugasedegeg.pdfIn PDF document text
    • http://zubrcup.by/files/files/30406031157.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/94625111814.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/74024314104.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/natigovof.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146573d5ba02---fokoxisatirazatexiligeku.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/fikuxewidariduxedomi.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zokesurebewuwidazukugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+pokecoinsPDF 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_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 18204 bytes
SHA-256: 5731382bf2c723af2a97f7cca0659146d6655cec9e9a1d1754da7dfa36499858
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 10556 bytes
SHA-256: ee44cb0b705ce0ab5df74fb08316a255dc22a18cca8b74d7d70ad4f0de4a196a
font_02_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1