Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b00bb4a6ae62e1…

MALICIOUS

PDF

74.5 KB Created: 2021-06-30 19:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 807a6217fd8f775db1be832dcae373ca SHA-1: df065a5761efe3a901075b435e1c78619d145e76 SHA-256: 92b00bb4a6ae62e138b284c53714227c9ab01a310f3ea4dd2ef7aab5a5dfa20e
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 utilizing the formcraft plugin for file uploads. These links appear to be part of a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2aaa4281---15507772080.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609679c72320f---wifedarefotawonomipe.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/59249446158.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cfe87586f---xigosipozemovolefal.pdf
    • http://www.srijonihealinghome.com/fckimages/file/fadixe.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879835e068e---salovidabax.pdf
    • https://zold-kommando.hu/files/71076697965.pdf
    • https://cortemadera.com/wysiwygfiles/file/pigajikoto.pdf
    • http://spamsmsgiare.com/media/ftp/file/jejenujimudijuguz.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aca490e7d03---devirolex.pdf
    • http://oio.cn/uploadfiles/files/30537155197.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2f97cbfa---susifukari.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a54d1e3587---64864121828.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9be0f2997e78e0e1adb0894dcfa9465a/wibefeb.pdf
    • https://motacademy.it/file/sixaroxanuleselivifudojip.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db25e85c474---64507707570.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/652abe7961359a6a31346df726e20ba1/domavilewifisinomewipiniz.pdf
    • http://davidhammerstein.org/userfiles/file/wolabedagokim.pdf
    • http://cucthongke.vn/userfiles/file///pujixuragewuze.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e64b496d---84827139761.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0c9e53266138fb2dbf27c44ef347ceda/6262360832.pdf
    • https://sunnyvale.com/wysiwygfiles/file/1523861741.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c8fv8fm3t4qq5ptufpru42ggu5/69352255639.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/a0dbf02a4dbacaadb73b71d4581861d1/fivavogotuvoroxesadi.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7eccecac934da2197c754e65183d0596/buwuved.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ff12dd27---gezujenonadimovekagoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=simpsons+independent+and+dependent+variables+worksheet
    • 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_off0000bf1f.bin
95b913464be318dab71dca9138d85b1af6da2d17d448204185df558ff3cc9220
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 16804 bytes
font_01_sfnt_off0000ea66.bin
2390c673f32dca191a0e72f23a545bd3519bb30475b136d9bbd8a3744dea5bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 11116 bytes
font_02_sfnt_off000103f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 16792 bytes