Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a301a11509ad15b…

MALICIOUS

PDF

94.8 KB Created: 2021-07-24 20:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50c60603a092d9b45342a7802c543acd SHA-1: 757501b15b829685aa66378c38de7350bc3235f4 SHA-256: 9a301a11509ad15b97be76a1772a9c51f471d0d23b372817bd247481cc7e0165
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure align with techniques used to distribute malware or engage in phishing, potentially via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vizugy.hu/uploads/files/60768614061.pdf In PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/wazapazesijofapofatiziton.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/99287859731.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/jmrct03nkg75glr2e9b3s6c875/39100690565.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/35926716345.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/pudipodok.pdfIn PDF document text
    • https://baptistfriends.org/media/28185188701.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/43109247931.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607718f2994de---konotowipil.pdfIn PDF document text
    • https://agatanorek.com/files/file/63683553443.pdfIn PDF document text
    • https://samowar.ch/upload/file/91358566190.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/27ce9a61896d7a466af5cba93fc7522d/gotuvulepoxuvuvorejo.pdfIn PDF document text
    • https://anjingliar.com/contents//files/38830989353.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/fasuxagekazawofitoxuwore.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2cadf7b4449e94216f0e3aa7929a6ae5/kisozutum.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/nidudixuwirozavu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xurifigifekagoradenem.pdfIn PDF document text
    • https://artbynela.com/uploads/file/mokevo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f080b666de6---wapedaso.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3pdm4hi7sfj3sl3mv27de7d1c8/49679350297.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/40962449563.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/dde01da0f3124707d0d2d45b99babeeb/52634611311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+read+gravity+falls+codesPDF 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_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 17552 bytes
SHA-256: eff220abb37bdc375173e359f0dd736fa43d22b21b075404972f7f1c83be88fc
font_02_sfnt_off0001553f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553F 10804 bytes
SHA-256: 51cddb0afda54c317262dcb41857f364a6fb7d10d0fdc9067478efd065091b49

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