Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a4bdea741f4bef…

MALICIOUS

PDF

72.4 KB Created: 2021-10-10 22:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd602896b51f9fdf6877e021935105b6 SHA-1: 9ad7f3ba463979d50ae3b6205769815f35bf1251 SHA-256: 02a4bdea741f4befea26aa448573a26c7f8aad80c9245886ae0d2584b6335cd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://proreferee.ru/uploads/ckfinder/files/37148196522.pdf In PDF document text
    • http://koala-al.com/d/files/70907584664.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/26674973257.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/liwuxibadupu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/kozobejak.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/45818206291.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/tuzeraguwudokupogak.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/larewepabagozipevujat.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rejitekizonebaxe.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/pumedopazivironot.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/84c568d648fa425055cc81ad4de9925b/25931887933.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/86fdef616e809be4745866cde4902d08/21317172565.pdfIn PDF document text
    • https://petikdaun.com/contents/files/gogunisepipozoxopofuli.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/dukanamuvisirade.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/kapifomasigetivelamumin.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/wasam.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/66538676200.pdfIn PDF document text
    • https://mistral-paints.cz/userfiles/files/26200927734.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/d6agcmsolste0rshf5hkbimus5/jatitirosuvajula.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/76851339281.pdfIn PDF document text
    • https://estoniapools.com/contents/files/nezevixunufebanajowufev.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/widesemakasa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/04559903f1233d8f695667ca6470114c/xusalijilidu.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/pejawawidunetedefewusidud.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7mlu8f4vkbg3ouoam9s9molfkc/ruvedisitimave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=isolation+of+starch+from+potato+lab+reportPDF 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_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 10836 bytes
SHA-256: 4662fd6e46ef87f5d117997435137184d36859330659f62711395abdf793ec9c
font_01_sfnt_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 16112 bytes
SHA-256: 066bf5d025059abe7c3e6f1991d550a4afdfe4f7f53d0789046d553d8300225b
font_02_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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