Malicious PDF — malware analysis report

Static analysis result for SHA-256 709519c1562f050f…

MALICIOUS

PDF

102.8 KB Created: 2021-08-20 13:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14945b40650e96dc0cf7c58459e31819 SHA-1: 6a1be2f895f3c6af7cdf585b4d33b4b077bb41d4 SHA-256: 709519c1562f050ffed1dc2914cad51db8a7ed70b64edc8181a6064f542f4529
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive lure' heuristic suggests the document is designed to trick users into opening an encrypted file, likely containing a secondary payload. Numerous URLs pointing to compromised WordPress sites and disposable hosting were extracted, indicating a distribution infrastructure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=gu%C3%ADa+pr%C3%A1ctica+para+el+examen+de+ingreso+ala+universidad+pdf+gratis
    • http://sumterhigh89.com/clients/863574/File/91218342353.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a449853f1c9---33988668684.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8495f6ca87d503ed43e485cde24ab182/75540027126.pdf
    • http://snotlicker.com/clients/10243/File/garije.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6491714cdbe67c3d67ba4300dfb12699/sorixunema.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a2886c497e6d7a92c183a54c2836b063/tibofunarunowezezo.pdf
    • http://www.monts.sk/upload_images/file/45852193348.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a9a5ed5f---jirobuwefedakoxasenitup.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b582c924a21904040030736d83a9923d/ginawu.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3831a5565bb5b0dfccda1a1c443d932f/3691010460.pdf
    • http://npi-management.org/ressource/site-image/files/jakin.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/bowevevipajokamimomikog.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824c8d60e64---lomaditafanofif.pdf
    • http://e-district.org/userfiles/file/72934465900.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7411pel64ms8mrs3dhp0drk8o1/lomabikukawomat.pdf
    • http://orikon.net/Images_upload/files/45005995572.pdf
    • http://khamtribacninh.com/images/files/funaxajazut.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19e441195---18849833445.pdf
    • http://suachuaspa.com/upload/images-content/files/towalaseguj.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t4os15nu318ohgk6merqdulash/71246823567.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0a026ec163437a399d88a10827b88b46/nixulevisokogamunomovemus.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/27819527099.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/t3bpd4c9d3n03i2sbes395b860/17371613578.pdf
    • http://cmtsport.com/pliki/43464387289.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/d59piarf0smecotdkdnn5ffn5o/59340775885.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4b16f5e8f2583708343653ed6bcbe5dd/fuwafibipijodiwipogim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001109e.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 16140 bytes
font_01_sfnt_off00012616.bin
1a7f4b1fa0975e09e6ecc4a2acfbaac6a1382bd1a76e63040cd3c7413b1a788b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 18648 bytes
font_02_sfnt_off00015615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15615 16792 bytes
font_03_sfnt_off00016e2c.bin
a9cb6844117775a2322b02a62638205c2a01d926e6fdb2553ef121b3f4e1ee20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2C 11512 bytes

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