Malicious PDF — malware analysis report

Static analysis result for SHA-256 def86be3c9fd2b86…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 17:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b3dc56e5bc52a6ac5606b02c6b2f08f SHA-1: 131fd9dea4d5365c01f3db241c3b7b0b3b59fa44 SHA-256: def86be3c9fd2b8643b657eaedabbc58b6fb1162539d78527b1c4bf1224f8b64
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links, many pointing to domains that appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://geologocarmignani.com/userfiles/files/figuvuvetejepipisajosina.pdf In PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/medojevuvarelo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa91179156---73335045503.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e1b080d9b---baremefewigamobuwobixewe.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/92446439030.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/it391mhq0g2n8gmijiaovu3k9g/18668218471.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/bisixuzom.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/lejovarevezulekoponi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077737e971b8---35455290901.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/bokepokimabamu.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/ligel.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/sidepiwumowop.pdfIn PDF document text
    • http://ibb-online.ru/f/file/ponifugij.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/dawevonedotideroradegib.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba641d7bce2.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160748667a5d51---xemuziwa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/l77373lnii9rj70iq5t3q0eg1r/80204853737.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0e2cfa29---89708371008.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/kunibi.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/53219561137.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607077bee3109---roduligomate.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/17693579772.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a9c175e1---12208602001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=life+orientation+test+grade+7+pdfPDF 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
stream_006_off00012fc2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12FC2 18040 bytes
SHA-256: 050b393ac28829a42cecb83d713991868f1f054f41f091320146d0bd1f17560d
font_00_sfnt_off0000cf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 18580 bytes
SHA-256: 92026dae6e2e1c3314aa392678c2c6a0cec0fe89645069b9175b541934e27856
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 10636 bytes
SHA-256: cedfa3b3f12faca5d72670e318f37bdc213e4fa13a40e0e94d5d0a0a6c95b712
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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