Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03fa9ab3d04b107…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 08:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45a72cbb0f742600c8e033b7206f353b SHA-1: c4a70a10dbd6773d22236ed0a38ec254b4ac5a6c SHA-256: d03fa9ab3d04b1072941bf0d0c7e006b4d1567feec5cbc6a9cec5b2564c71c00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8be3dc6a---36921745332.pdf In PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/37667589642.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210906212632.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wuxefutabupanixaxolip.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/niwimexidubifu.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/85935706259.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/66589519873.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/detoxolosovevewu.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/92554216294.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/jurodovinoguto.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/13204122591.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/nejezawedibimo.pdfIn PDF document text
    • http://glttek.com/userfiles/file/99809716726.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848ae6cad0---tolajivodura.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/28524199832.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/75327947490.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/68506031634.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/66418998931.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5ef4736adf0773d6418940b99950ef5a/bopefajizatuwi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7805874048f3958a3c97b87be513a33b/vitotuf.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/38657068270.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/dibesonawew.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/55832747305.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/96418576474.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef638df0f---lofovinigamup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+location+sharing+app+for+android+and+iphonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 17300 bytes
SHA-256: 1b5bb9135a148b1a229f6631b04f684292801c93a304a3a8bf6058cadf5e21d0
font_01_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 17640 bytes
SHA-256: 22a472ca97e75de19484ad207b69f0c9fe93368564868d0b65eca1cdbbaaafad
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 10952 bytes
SHA-256: 2d2aa701b90ff51a79e2b27d6fab0b332bcd74d80a613efaf2831f9b6e33b10d
font_03_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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