Malicious PDF — malware analysis report

Static analysis result for SHA-256 168c521055cb417a…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 16:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0dad7f4de00739e14f7d955299d9d6d9 SHA-1: ea2353eb4b83f1f8fe999ca60ff1db457cb10e89 SHA-256: 168c521055cb417a5963b6b32f8c1ff57b5aabc68d14a4c2ca2c6f774c51bd7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a95c44906---44901443452.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610072b848bef---97771019571.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fe9c0b15826aa3068f60b94099a1e4c6/parutuserovotexebuloniv.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vesujijozazaben.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/rutaxak.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n7508rcjvloejaqek9j8dot7k0/59958180884.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eb2ccc0dc9bf306f8e6623624c6c6669/zogidugafobakamima.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116c77b251d6---37806652331.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aafca28af8a---sumeta.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/45819790441.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/zujujaruwavewa.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b810ae2faa2ba0432161c07b0a43a25a/tirogikemukapeda.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bb7eda183764fe1ee116e6de31825170/gudarepojovikuwalatuki.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/3607074645.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cfa93393a---fafutifobujabuzeli.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b8520fb7---dapubepowedo.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/refufazalupunubejim.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bj1d82dhh8ve8hcrmuk1fhfqv2/fuloni.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/ponogokovirewatakoxot.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/wedekiguvebararaxodufuduk.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2476cd78a---mojekatuzijoro.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kugodonigojusuganevov.pdfIn PDF document text
    • https://stopserv.ru/files/file/ludotefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2019+toyota+4runner+manualPDF 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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 16472 bytes
SHA-256: f26f7a6e61d8d5bd7fa5662c152631bdde61375a741ef753759ac5ecb1b43127
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10664 bytes
SHA-256: 574675e206a8c95c280b3249339a281d90b393c8c943b16d49e1ed89375e1477
font_02_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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