Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba532e68d6fc2516…

MALICIOUS

PDF

69.9 KB Created: 2021-09-17 02:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d76f405e615ade855eed82ba8f26e0c SHA-1: 1d8c54a153a1d4585ed8eeab6f47efc56f41c415 SHA-256: ba532e68d6fc2516d5542786bc1144a42f4520c7437ecfe91589e3a8f5b6ebd5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/d9bf4ad7da138940a787227d0e57a81d/gogino.pdf In PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/guxusolupigutubekumekipu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d852c9a78---28956385611.pdfIn PDF document text
    • http://flexa.cz/docs/file/2137595635.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/35918298204.pdfIn PDF document text
    • http://chokysitohang.com/Uploads/userfiles/files/72178763773.pdfIn PDF document text
    • http://24cvety.ru/upload/files/geruxoxoduzut.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/85867610683.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/41e0d3e2850c143048594a39349f466b/59744236054.pdfIn PDF document text
    • http://mutitar.com/user_img/files/nujoxemuz.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/24942550193.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/bezogel.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lm852octm4are976mk17ddj3r8/93558036197.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/34105953473.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/87224061674.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/vedada.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/52457202163.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/sewus.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/56375009342.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/49920237445.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/30290338087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=quran+lite+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6b239df550902c64926d7ff8fc54f5c3/riworunidik.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_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 10208 bytes
SHA-256: 3afb6007798ab8aea8a7961c606a17b7aba47b109976360e192fb5d00bb877aa
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 15820 bytes
SHA-256: 1727ef83bbfc5aa084cad858fee19eafca107c7bdf4f9bd73dca7aceac26577c
font_02_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1