Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1c3b8eca1e09ad…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 03:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 666e22a666baaa8718c44ce589a1bc89 SHA-1: a2fc23fc040dbbb7e861896221af709a8ee4c454 SHA-256: df1c3b8eca1e09ad8b3a45c649dd156fa8bbf3442566a0ac91a7b2f792e5c464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=que+es+el+magnetismo+pdf PDF link annotation
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/38660749980.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/56147779869.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gugizutibupivebowog.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/dopasumeb.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d63a89906e---82295753540.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b899ff654a4---21828915287.pdfIn PDF document text
    • https://33mobility.net/uploads/files/dogekopot.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/86731238742.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/77554739491.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/5i2117u5kb9uscp94fs2pai1n4/53169288099.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2aa8cecef757899f876bb7d0fe5252ba/xupojerax.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2en0o2vkpd3dkevqnqer1rg12d/69947739972.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160869d470f26f---gomakinaritu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bjvpm4ffvd70jq2837ctges6g2/wokuwebenujofazex.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c00b80670---ziwifej.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607de4362a647---petegogivomuserabup.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rcmasmvp5ss90pt55tr3o0m7bf/94093812206.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ahqahj41hg707i2hgfp9aebe0h/ruvitisek.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/55072335778.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7f15c02946359a048d532ca7411eacab/94257983874.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/13154233467.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tgva393qiu348aq1gkq2g9dodg/zedamitiliwadodezuvi.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/wifewopaledivusuperotumi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/65ea8f283efcbb2b3f4ec256a8fc83d3/82073402321.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/49257930340.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10900 bytes
SHA-256: 5bbc40190b9b855c730ae3e0c5ec853686aa74db755492c687f8f3c9090969da
font_02_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 19440 bytes
SHA-256: 8adb734ef280d680723a25cf93b28b97ba32388a673f1bd3dadaedd61bd0e56f

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