Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6e87c8237be7c0…

MALICIOUS

PDF

79.2 KB Created: 2021-06-29 17:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 20e538a804feafb4de6e64c8185b0069 SHA-1: 085d351616f44eb0e89f9a81e3355f0aad392a80 SHA-256: 6a6e87c8237be7c0d12747fb085abcdf34cb3c829924601f1f831a2d96f01714
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URIs pointing to various websites, many of which appear to be compromised CMS upload storage locations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the document's purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=research+in+mathematics+education+pdf PDF link annotation
    • http://detikakdeti.ru/img/file/13795414067.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/18733039931.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e65dbb928b---23936554324.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d909fe35f0e2ef478eeeb863e294ed72/78148586409.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/85980902496.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/tugejojilikufevipatajivon.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/481bb8a24cfe7a1098e35e40e530169b/zoseneker.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1be4ecb72---12573008012.pdfPDF link annotation
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f2165b9f13c615960147b38dad093d86/xisodunilabijesopimozena.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/eldleqppsj2r8of9s9idvkccs7/19746190564.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/radavofalo.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ba69c41216b9a0d777dfbe41982a2225/momiwepuvepegilamutural.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8496f8ee86ab5fb060aba80f7bb19d5e/56901376966.pdfIn PDF document text
    • http://strandedtattoo.net/file/16715845910.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/7966055343.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/n1ouvh5u5jg5vhl3jd5jiast4n/junawifozufurazomolupi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb200a4633---zajetumarunep.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/73705814840.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a320322a---lotovera.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/40305de579fab1e39b757d33b9ddbea7/33044206921.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7266e208f383e705868172602ee7e010/pomikovomab.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/76394926651.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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 10984 bytes
SHA-256: a548531ecadee8a2217ebed2fa10ce51c4beadb273454f7101ddcb8006799064
font_01_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 16504 bytes
SHA-256: 40a366bb566dadfff31d56002ae0a0b09b4500d1e420631d0ed17d8a4f7a1085
font_02_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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