Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0646f5ebb734041…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 18:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f2368e44b5d0cf9430c4a2dbddbb59c SHA-1: 0e0a4ce5d34e5899955e73acbb8b8997476aede9 SHA-256: e0646f5ebb734041ecc8a1bbab6b05c9702e6ca5653cfee6b951a5a2e45fba26
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure as a link farm points towards an attempt to leverage SEO or other tactics to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8un9volspvpu7r9ptu2v45odk9/93911627238.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ikplbpp02knsqei8dq32torfbf/57271707382.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607675e2f06f4---sipabizemexibudiguxud.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/548f343ffa8a2278c840e228dcd31575/27077214237.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d5acdf9d1---53850513370.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b110b3cf48a---pexer.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160726b27ebc04---jagavukiligevake.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/74cf3e9114885f87f5504ff8a75c0aaf/wemosozuj.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/430e3dca63353540cfa41f91cced4f15/63206469768.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb3c30290f---zisetovetavonififaz.pdf
    • https://golf-tout-terrain.com/publish/page/file/xapakibitapunojuf.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/ernlm1d1295ljobn86r53h737r/19802744191.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/763574dbe26caf699d37a6dcd0b04f3f/jonojifefumari.pdf
    • https://mfdesign.hu/files/file/24591931757.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9f2a5d8ca---juzebalomorumaviz.pdf
    • http://provia-events.de/pics/fotos/1/file/kikojulejaxebuli.pdf
    • http://adamlegal.com/userfiles/file/gufanamuj.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8ee157513de316b739c09b41975bd285/70981180500.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c5fe0c01---luvewagevulujolamubadunu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/550169601a43c0e393dbd55a14187225/24236780892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=third+trimester+of+pregnancy+weeks
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/449fbccc3858381ea069375f9f369a17/72325483851.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE974 16792 bytes
font_01_sfnt_off00010186.bin
d44eb075f9060313c84ef9947b6e521e20706be0fd979f1819be3c01f90fce8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 17092 bytes
font_02_sfnt_off00012da1.bin
d08009b5438a13b64a286e4e0e5dcac436294b92bebb8f4479872847e177fabb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA1 11276 bytes