Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb92986ac25a431…

MALICIOUS

PDF

82.4 KB Created: 2021-10-15 20:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd52c7a4d38a50e0305a126e4a9bdfa0 SHA-1: 5cf7e8966a7bff71bd551480cc8454986f61fa67 SHA-256: 6bb92986ac25a431fe4d579ed46378eda50072e95bf0da869a1e53f7b326d444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a common tactic for distributing malicious content via compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=council+on+environmental+quality PDF link annotation
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149de2f7ee02---7643021430.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/sogote.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161609ae85f5ea---73340893344.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/puvozovagubijijapuzoxide.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/82785803852.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615144f3673a9---domegagub.pdfIn PDF document text
    • https://birudongker.com/contents/files/46426052635.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/21818721383.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/didasogujo.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/61298280257.pdfIn PDF document text
    • http://etnorom.hu/pictures/kuzovaraposusunel.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/juwotipegepuposo.pdfIn PDF document text
    • https://jensbrode.de/files/file/95731958318.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/79882558259.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/14652504924.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/lezakixumujitilusufodid.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/tejudoledamojoxepojifam.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/70483250861636d923f995.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/3785060692.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/85669346154.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/pidakazutexovow.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/waxizanaperezuromadowodu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/52232357907.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16168e8e5cc847---jimetipililuwodirer.pdfIn PDF document text
    • https://salonrewards.ca/images/file/36431817020.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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 17964 bytes
SHA-256: 2f28be32eec9bfb047dd5da3db61fcb07b45685c10d96054ff8b81af6972f19b
font_01_sfnt_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 10680 bytes
SHA-256: 516b2d94fb2bf57a2bec951f838f62ac8a4d233c7dfc3188317f5d415e0851f7

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