Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8b8f220f511ed2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 09:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d84b64a35d2bc04ca6c2b26a309ac38e SHA-1: b7321649efed969808883db3e6be9410ec294c15 SHA-256: 2e8b8f220f511ed25015934ff4cf777cc53c99d423fe20dd4163f8c9d030181e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded URLs suggest an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://casier-a-bouteilles.com/file/kuferefutedus.pdf In PDF document text
    • http://smcertificationservices.com/userfiles/files/dukutula.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/21066228436.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613651155e0ec---73640699996.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/56437630371.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/lajozejeguvet.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0b3bbcd8---lesamofufejorogerosane.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kapudebu.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/tusoxasalob.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/didebapamisatutafor.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/20134041800.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b7edc191a8b5f60e9f8f47bfdf072b8f/zugifenuvigifizuvubipig.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/takeve.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/51737517039.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/fezeniwojetodoko.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/zatizowupovozuvu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/motolawalugadereruki.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/lujexotirodu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee98990e5c---40026272631.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/zubegoginupupivozotobezan.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289f16ba69---buzofiwunedazalowesib.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/witej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e89113aa---83179325362.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/11603570464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=can+i+use+mouse+in+android+phonePDF 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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 10644 bytes
SHA-256: b1c814e82bf2802702e32a17bdbdc4444ed7c0f6b89754e2692ad4cc1e894651
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 17620 bytes
SHA-256: eac36551a1818a853f946f29611438b1cd69770a1f991d46882c3e071fbc99ba

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