Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1374ce24cda068…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 02:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b540dbd8e936b88b057905cdeed6091 SHA-1: 26aed81cbc0542c0d6616cac88b1f7284ad4dc11 SHA-256: 7a1374ce24cda0687cd239c1b46a25130fb7ac349917fb7339e19f1bcf1bc521
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, forming a link farm. These links likely redirect to phishing pages or download further malicious content, as suggested by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=procreate+apk+download+android PDF link annotation
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23144548622.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b95155361---ludenekakotawetotufiva.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/lojonudidewaxat.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zefare.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zuvonifozelakegamod.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/xejoritebubalaniroluxuli.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/mugora.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f221613aa5---60283519708.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/22632097150.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/xupiwisusexebotazonad.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/32953451293.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/panaju.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210910203536017654ljo7nt.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e0e0770aa0c68ca32b05719c64be941b/4554783563.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/21441981444.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_52E71DAFCAC16222.pdfIn PDF document text
    • http://17njl.com/userfiles/files/jipinumunod.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2gnvd47a6kdojvpgmgp2nfsa99/87760869516.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/73200643980.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d83f653ee---rafavoxosof.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/renowogunotov.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210912093331.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 10520 bytes
SHA-256: 710a96be871f0f8ba0a15574e23f9ecc18277b1bc75367a21c4191317c21b121
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 16740 bytes
SHA-256: 4c8f537e917e86bcd990d7481a7e25a469ad145610c7384f47c06b04b2a5b327

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