Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9e3c3d9efd8f41…

MALICIOUS

PDF

81.9 KB Created: 2021-08-27 18:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2655e6049933f4703f8c3181fa485009 SHA-1: 45bfb80557c1bf18544644a5ba48ab742b27a210 SHA-256: bb9e3c3d9efd8f41610babb096bd1bc1db73c08ece7490b4cbd62a63561d0623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/46b38c97fac297d45137619061871dbf/25470697091.pdf In PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210620201236.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/lijek.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/s7cv4m6csm7ijj1ub2707r5hl6/52894807415.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2a0f4f79811cf5632e19c2739297a91b/85309194800.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/fibelikigu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d83288c1---kugegetelasuxosukome.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1174d08445---40817970597.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zuponusuzuvokoronobog.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/8001537608.pdfIn PDF document text
    • https://bio86.net/fichiers/29198877626.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/durawolar.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/94061743191.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/18700806627.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/85840273507.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf981e053---32017602775.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b71f35a5a4f---75864385253.pdfIn PDF document text
    • https://limadelimon.com/images/file/41557517322.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e382a5e9a6a14d698d1ffa852c7e73c0/52283602074.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/77764782405.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/abdebb3b4fb8cc1aab4e27797a14ee32/96904983216.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/kodowusa.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/piporag.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/44281414189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+defog+windshieldPDF 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_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 10448 bytes
SHA-256: 4e0372f862ccb7da9024af79edd203deaad17f85b8e50c37099dc879d1f7fa08
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 18228 bytes
SHA-256: 9c95402636e2cc371def9e11a33500af931ffa645f57413d545514e0e3eab1ed
font_02_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1