Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa3c82cf6cfcbbf…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 10:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5551c1d6710d01d86f5232409550398b SHA-1: 1e9720a75b1d10c408b2a9427a30614de9ea41a6 SHA-256: 7fa3c82cf6cfcbbf2c797124ce1f22e927adde3feda07d2aa7f5b1997eed2a45
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cnhhgj.com/upfiles/userfiles/file/98021358575.pdf In PDF document text
    • http://labsshop.com/d/files/86773194297.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/28031906756.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/gujaroxa.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613353643b703---babuzefajegefatefugenu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fe85b9c9---15583192267.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_1311CC4358F1254C.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/95753663006.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/vudojinagoxigapefonele.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/nezelejidajaguwow.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/nezugebitufi.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/josimuwemaj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7a9b00e6---xavobutejabukosuzomawap.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/zipofalilodimavejituxejiz.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/zujinirukut.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/xufebes.pdfIn PDF document text
    • http://leguido.net/files/wenevosoritujazuvur.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/53134129430.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/jovaxa.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/pigusekozof.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/zitokopiwuzizuvatatalu.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/86088484615.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a1b20f09---jeselekoti.pdfIn PDF document text
    • http://ping-property.com/user_img/files/novodumivanebosapifaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+half+of+it+123moviesPDF 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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 20468 bytes
SHA-256: 4052c8353744e5f2347c39640256bac1ffd531e286dfa77797ec9a1ef68537c3
font_01_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 10648 bytes
SHA-256: 04e5c054f783dc2579367b6c6eada4d48ab84d5e17402297f44b14a2536f0f88

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