Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ec9e2940e8f43e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 01:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b390e0854daf62b42ff9559ffa50810b SHA-1: e52103cef62b14570a2dc96e05477ecf185520ef SHA-256: 46ec9e2940e8f43e7c5d527b144e734b285dad7b624699b89428cde671142255
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 WordPress sites or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://brandnewgoods.net/userfiles/file/ribomegosejitorizofas.pdf In PDF document text
    • http://cokhiminhhien.com/media/ftp/file/8470924792.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f566a5d4---jiwosakawetomokumol.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/rudunemasukuzazunub.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lasodufetuxebamabu.pdfIn PDF document text
    • http://unique-u.biz/images/uploads/file/89397311189.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8u3vi1s9lokonjhkau137f5lbv/pufuva.pdfIn PDF document text
    • https://chptravel.ir/data/file/25157800702.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106270603167707.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/midavisuvowegejetivizeli.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210517110606.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/801ea36ad943e62cb74b9aafb72aad41/69975586192.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09fb63350---60449631267.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/4n9g5h27sqhdiukuk5nbr1mq67/kukezidopodonot.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/35792826679.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/df30c424722464e6282731439d1920c4/17329711536.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/buxumopuzir.pdfIn PDF document text
    • http://landpas.pl/upload/file/17277052105.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/pinabunasegi.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/54914975472.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16269931666405.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/xogedogoguburaj.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4783743f---gawuwupazutunim.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d9754545282e85925966e345d408ab55/bowolizox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cost+to+build+cinder+block+housePDF 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_off0000bfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 10668 bytes
SHA-256: 6e451917ec5ebda38d13971ffadba339181f481e785cd63b498ea3aac70a01f7
font_02_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 15440 bytes
SHA-256: b722ba633c504d76e497967014af502ca52231faa0818410fc29c5bdee18fb0e

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