Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c3d57d19b10df8…

MALICIOUS

PDF

103.7 KB Created: 2021-07-22 17:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a725b6f9bd3f93fd13928767b6897c2 SHA-1: 640a64ed19ad6c2d712021fe7aa2bb93cd14fa65 SHA-256: 20c3d57d19b10df82a9b2582b66562480671db2c4cddcd440f3f43624dc10bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the distribution of links to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://fotografiafrancescosomma.com/userfiles/files/5151775388.pdf In PDF document text
    • http://ztkammer.at/uploads/file/26013488950.pdfIn PDF document text
    • http://fotossc.pl/_files/file/sazalerijusutuv.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f2cd4b0c73a8c6d17a8e76de4cbaec85/68738482959.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c679c4863---kemuse.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/midupoxasejexa.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/kuzigo.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/205466d660d1906707c88ded966155eb/6175530334.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b2459530786eb67e2654160b6cdd274e/sixorirurisitekinab.pdfIn PDF document text
    • http://santeh.md/img/files/575931294.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e325891641---geronivebizagufid.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb13cd97e7---rawidabigufozinazil.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f814d3b12a8---keruponarabemudoweba.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/garumejen.pdfIn PDF document text
    • http://gptools.net/userfiles/file/nojabumaguk.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/75bbb64421d1ce044ab8eea18a66d2c3/50558146500.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/74577226923.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d816062e---siredinodep.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/34178023271.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fd9d92ac895a6a345c52f96a2623b8a0/46029957758.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59bf14c6d6---binugojivalipoxewufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=definition+of+impertinencePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001016b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1016B 19160 bytes
SHA-256: 11d8a310f96b4d14ea4015b978692a3aa3cbd3d0d546f0e45ae4af318bab1604
font_00_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 3444 bytes
SHA-256: 7e4c79842547a68be3c9b8c2bd6d1ab544bfc85151f1809ffdf5173b17eb8e69
font_02_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 25540 bytes
SHA-256: 59b2fb2b8c48a5cbfc55184591d5bab74a480dd8935fce95e6d0383228e8264e
font_03_sfnt_off00015f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000177a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A2 10264 bytes
SHA-256: 2509afae5692b39da38c0ffa8100ab3694572c22e2dbc59b8683c7c221ed2e7a

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