Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb9bfeb50c0bcb2…

MALICIOUS

PDF

89.3 KB Created: 2021-09-11 09:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dba2ce78fdb6f79c7179bd38f6226c1a SHA-1: bffb3da1d183ff96667cfe2ee80276bf929c9cff SHA-256: bfb9bfeb50c0bcb207f2fc5014995a39f9137a4fe7b1d5614c009c343049f73a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://newtrichur.com/userfiles/file/wokif.pdf In PDF document text
    • http://hsaltsj.com/uploads/files/nedikobuzuwevowila.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zekekifokamokemod.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210907060359.pdfIn PDF document text
    • https://thehouseproduction.net/file/93725244317.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c511e14a---73834292279.pdfIn PDF document text
    • https://robodom.si/files_vsebine/vusozeripikutiz.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/50150501483.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tivipigupekixibovifipi.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jikigisewelal.pdfIn PDF document text
    • http://klenderbio.com/upload/files/sozexusog.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d849da29f---6815594418.pdfIn PDF document text
    • http://myesen.life/userfiles/file/nesuzezeba.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/90240127021.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/nodirekoletufowumafu.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/kuzunekuxepe.pdfIn PDF document text
    • http://xhzhengli.com/upload/37731676088.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/pigonejavusutovil.pdfIn PDF document text
    • http://lovesenergy.com/file/16269720314.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/54335500786.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/debifexaxezuvafufix.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/wujukokadusudemudowibe.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323fdbaee34---9827685842.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/92432014128.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb057e6786---befulupivavomej.pdfIn PDF document text
    • http://vodnik48.ru/content/file/76895325891.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sumupi.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/jakafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sat+prep+black+book+second+edition+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 19320 bytes
SHA-256: 29867d5b5e8edbd1b770cdb8e336b119c2f2b6acc52828351856585f2852e0f6
font_01_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFC 11004 bytes
SHA-256: 25ca26da0849a8ec123a234e9551c1a062c4456858aa4e12869eef87ebf99427

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