Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4032d4a5ac5584a…

MALICIOUS

PDF

85.9 KB Created: 2021-07-23 10:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ed2e2a32050951bc854679db4c61872 SHA-1: b231cc1518f18e38ec903c13e279b7365770b4c7 SHA-256: b4032d4a5ac5584adf3a316ba8521c7058ae490b0175568122f7b801838f50a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a likely redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6315aca81fc91eece2a4a4e8a749c348/95661377535.pdf In PDF document text
    • https://bednidhitraders.com/userfiles/file/luperureka.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/57165814532.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d52d81c9efaaa15f602b2339db9fe6a7/37604776932.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/7167297267.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e8c77d94df753fd21b774e57093f514f/varebadexadegakezirimaret.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/61360352231.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9150d04d9b---43452573690.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/pupuxugedovabed.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/750uknpl832ofg8qtnd8bjllr0/89126638189.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/fevotokosivawamege.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/jagamevubuvi.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/tozidu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/tajik.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/41949285840.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/10635167715.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/79674340613.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18f122130a---vugexizavize.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/44ed2b24a9264de639d32ca5adc78be7/xoxowaxifavol.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c897a72d937---wogoxonava.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/lamudibigatimo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qi6oe0248v1d9gdahda70vjo5r/54822459280.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/gegivefagewezinub.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160868824d22f1---6590376130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=erie+county+tax+maps+gisPDF 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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 10972 bytes
SHA-256: 29c51782f57c3da8ce6c8ee6d80a3269290ae9682745c50cbfe4b4839b7cb8d5
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 16872 bytes
SHA-256: 3a56ce45a204cc06b6d42ac02f1fb617ec5cda162bcfb643b3ab1953783b376a
font_02_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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