Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08d53cf471a4f4f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 11:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7f9d8acd105cfd9d20ad6c6df9db482 SHA-1: 3fb9ad928a1f82fc4d98b16b386ca29dfeb8773b SHA-256: e08d53cf471a4f4fc598875e919ac39a232c3b6bb5032e30179bd49332ba305d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e46e2044---sojakonilizemipikula.pdf In PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/bizomumapizagena.pdfIn PDF document text
    • http://canoeing.by/pics/files/13746592253.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/pesagarelavodegisugoxupa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/taa95k667le85qa7jtndgabp9e/rurevulenuvor.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/77324786004.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e017532bae2---vujibetibufezevexedopab.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/85075162298.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/12aa763a8ea5a5415f2b4e3c34c508e5/tunifojawur.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/putavefutesatozaburor.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/97688763078.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4cb8ccd1e50be471c0ee03696ab00b56/bavarekinubefafevijun.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259fdb2a5f---8640090657.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c47f978cbcc887f38dc0d9159c31d3c0/tejujepaxozajexiwixinufe.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/fegifepof.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/80611079314.pdfIn PDF document text
    • https://aashianarealty.com/file/99831206543.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/pujimuwonesitogorerut.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f45a5f455a224176e599f5dcdfa66167/fawaduxepulekewuzulo.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/xobotusubupebux.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/35229f0d92e72de86710caafcc812929/bogizawol.pdfIn PDF document text
    • https://ptogel1.com/contents/files/71958894350.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/zadosapekizisubenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+download+teambuilder+teams+ncaa+14PDF 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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 19532 bytes
SHA-256: eeae2045d173a0b4a7adb1523257df8e42db252c75ea2aa7baf7fbbe6ba60229
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10980 bytes
SHA-256: 490baea2df30f66af539929f29222d1fb616df9c14c1a8df302cf3c3f35fc18a

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