Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35b5ced2386b76b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 10:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5746bd58028ea4511e7026669099c75d SHA-1: 09c89061ff5d0f0918f644e70909ec0c9da18deb SHA-256: a35b5ced2386b76bf3aa6b6a744245de9776296b35d647e4948d3e26fd0a6beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the nature of the link farm and the embedded URLs point towards an attempt to lure users to a malicious second-stage resource.

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 http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de9aca8bf4---71726621789.pdf In PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/zogek.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/sejepinogilufapogitotoge.pdfIn PDF document text
    • http://agavietnam.com/img/files/runuvitupomibu.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/79482910173.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/gitusijodopir.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f315a8323f---72721868650.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/fagudowubomonufar.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/99981487448.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/32013156343.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jaguwekiwixoliburatof.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/sojezame.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/35197101116.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/94194764424.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614567ddc4dd9---xarirufujonatozogafekugag.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/putak.pdfIn PDF document text
    • http://julianina.dk/upload/file/3502116156.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e9050883---retenuxapuviwerixuzizep.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/95195433308.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1d6f96b20855bf66090ba9b0e9485eee/72827572805.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/8556049902.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/60466434021.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/busavudijetobinerizuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+off+sleep+mode+on+android+phonePDF 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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 10940 bytes
SHA-256: 6b9666db9178039c16b5cd4d78ec69a4c2cb4ac67dddeac2231a0f900633cbaa
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 18028 bytes
SHA-256: 4af2b26522978ea74e27d3dfbad1229f8f93fca346c671303b1b71df2c97f8fa

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