Malicious PDF — malware analysis report

Static analysis result for SHA-256 901b44b94470e513…

MALICIOUS

PDF

88.4 KB Created: 2021-08-17 03:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0ac92cbe5bab8670639db03461d91c5 SHA-1: 472aac3eb84655de508212318e00ce156ca6316e SHA-256: 901b44b94470e51347e2222a772d91c0138486fff70232fc93fcae068507b52f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ae19c8126a23c16e1b9e8af3695e8b59/sasakanodosawatibe.pdf In PDF document text
    • http://termocity.by/pics/files/bepusafesolulukazitezig.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/memumememotifumosup.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac82a879d5---mijitiz.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/vunifipigubaripi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-8/20210708132315991396.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a21394a5---97130623508.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/bitejupebiwimekozovo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/40677178833.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6f46b336a404c0a676ee73972ace4e06/91532433850.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/mimaviwewamubabepulefiw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da94530a7---nazuwutuzavijijin.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/70035b5bfabad34d8373e6d5b39447fe/45993405276.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/tupekedumi.pdfIn PDF document text
    • https://bnovum.hu/downloads/33999455482.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/denazamedekudugozokilam.pdfIn PDF document text
    • https://laps.pl/userfiles/file/90235781846.pdfIn PDF document text
    • https://dineflon.com//files/dalanudew.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210527162215710257.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/77852794686.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1df7f2c4f---jopazijiwodirad.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/xikexobuponopate.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bitokoxiriwut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+the+difference+between+ar+er+and+ir+verbs+in+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10836 bytes
SHA-256: d580ad5e9590e6639c91b442d4b6fcf0cdab0754596f5ede8a0ada36be54c09f
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 17904 bytes
SHA-256: 494b8da7cc6391f680914095d4994a228227eae69ed4da2617fcef77ac04b047
font_02_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742

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