Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6fb71b7a356512…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 20:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22dc3e52722f6e49f4dbf4368f87de80 SHA-1: 56559795daa4504afc13d87995de68a2043881bd SHA-256: 4e6fb71b7a356512630eda6307340d18a752ad91226a3449e9f0ecd06c67ab1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=how+to+draw+rapunzel PDF link annotation
    • http://aylincinarli.com/fckfiles/file/65783930429.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/buvozidegomejopuruxox.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/81354371733.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/fatewaxan.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/tijivotuper.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5a609002---16476101665.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/wonesozokiwovojinipat.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/puxikupowogaxotabefo.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/30488586354.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136760287440---73675065909.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/31909128658.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/12798611509.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6942b8210---54580257261.pdfIn PDF document text
    • http://coachhouse.info/assets/file/47860148233.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/5596241925.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/tavulizexejidevowu.pdfIn PDF document text
    • http://stisk.com/file/lidonazutufagabesi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/46cf14eeb0feafd705a9e6627a622b80/29294407995.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab82c091c---wigudubedamuromimuv.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/72920587057.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/64411584283.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/28319695766.pdfIn PDF document text
    • http://metapolar.hu/tmp/48557588902.pdfIn PDF document text
    • 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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 16604 bytes
SHA-256: e5b765cebc1b468d9a91d3601ff6b0edb24c4c853ecb93cf9f1b68f6842e1f02
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 10360 bytes
SHA-256: 0ad2c3a0dfeb9832045a9efc3972539cec20dc6e0c55aec7bf40dfd03e1713e1

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