Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c52c511afbbe1e1…

MALICIOUS

PDF

90.3 KB Created: 2021-09-01 05:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af02550441d2041af8076fa823d83af3 SHA-1: 828c0d127f91dc7d0a8b3024a5e77cc594c17908 SHA-256: 2c52c511afbbe1e125970b2804af3a771f3288d0a318f15619e873c175b44f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest it functions as a link farm to redirect users to malicious content. The `utm_term` parameter in one URL indicates a potential attempt to track user engagement with specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=android+spoofer+pokemon+go+2020 PDF link annotation
    • https://nepalmicrofinancesummit.org/userfiles/files/tuzazifubokokuzitiwivabo.pdfIn PDF document text
    • http://mayjack.com/upload/files/zafilaj.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/57995220161.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc86ae6af---tonepidelikasuxiziribid.pdfIn PDF document text
    • http://fitviewer.de/files/file/42236351376.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3eabc101d2de1f846a26eb14d902fbfe/dasulugovomosune.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/bexipaxagexowikijuneva.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088b20841657---55709721503.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/21965584736.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/39991045579.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/56993941733.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3dcbf412a2---kumodetusejisokaxitibixa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaa4212193---xuvasoxiwazewavojag.pdfIn PDF document text
    • http://0048.pl/48files/file/mofozogofumasurazapanuk.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e806a196---wuxaxek.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/zabefaporenifetosoxalolew.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gcr6kvi5kd93nscsaeu46d45rd/1234018414.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/fdfd41aa9b417726e33ce4cc7f2b93ea/xifebazel.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0f0c85939---mopemavivuzakepebarov.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/somavutekunemejapos.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c70e64d49---70921832014.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ad441c6e---baluvapiwusumedazat.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lgaug354dodmmfr9qbdcqps5c2/biviwolelibe.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_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 10848 bytes
SHA-256: b25f2d77d885c92817bd95418e1292862aa85a573332f1d01f4988a77030b340
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 17868 bytes
SHA-256: 21eb876348909ee516403daa9353c35162d1e61525ae552b7e3ed7ac5cd39ed1

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