Malicious PDF — malware analysis report

Static analysis result for SHA-256 186c863e67cf9aba…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 00:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b85a5325909d016dd85903cea2f2130d SHA-1: 7720aa7d693b7da89af026ceb375c769650b9f9c SHA-256: 186c863e67cf9aba5f0b27f6a50649b9080b10eb0f90d1fd5ab4ee7295a3b4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious PDF designed to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=adding+mixed+numbers+with+unlike+denominators PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea1fe0e11---51655714135.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/50d6cf0e285dca84b86da4ec50b017b6/kogufoximomemenif.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/filus.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd91479423---sadadekuximirumex.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/fibapebimitiril.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/60064711897.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/c9aabca0b6794517acece227cc750beb/38674123439.pdfIn PDF document text
    • https://netpage.info/userfiles/file/64227771207.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/83981260575.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4e0ecf81---66620322610.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae2bd34c1---tiwajuzonotemigolopojatir.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u3lrp4r8ktc1fbe1flddbjl8i5/69861723805.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/24851f7a70e597dab111546cb5c4cff0/92004230230.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/63660473895.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/mazamimo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/25fb52d7e4d4e86dd31f3d3ab1c80414/9199517710.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/xakomanepeloraxemikoko.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/vonotawexarosemesobamak.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608013e23e703---57953452682.pdfIn PDF document text
    • http://llux.vn/uploads/files/44443727183.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/41715240337.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sefifixetezudifukor.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160885c7497bb8---xenokuviri.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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 17892 bytes
SHA-256: 68c362aeec0a43ad1e206ce09cc19a8ec0ceb6429a989d3cc6b1efbaf5ab766e
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 11196 bytes
SHA-256: 080c31c1b116c4f32df75c6cd85ea1de4f9f48625149133b0f86476fe064295e
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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