Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b730a0d522242…

MALICIOUS

PDF

83.1 KB Created: 2021-08-17 20:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 889d2353dfe865c8760d1bc32093a9af SHA-1: 1aba10e4543d21ef08e14a22a34dd455c4eefd51 SHA-256: 828b730a0d522242c538a227bee8db83a8f65bfc7251f8cce75cd63828574ad7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on a compromised WordPress site, suggesting it's used to redirect users to potentially malicious content. The presence of numerous external URIs, many pointing to disposable hosting, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946fe2250b7---68687214055.pdf In PDF document text
    • https://cape-electronics.com/media/file/zijepebakaverili.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/47472501232.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/vizolopasowutel.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6ps61b7d4pjvbqprv9ptlg3du5/lexabiwilorokajej.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/7105909630.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df16218b2---36630861273.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b029e757f0---22362456741.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/92015034016.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/guwakegokopukefa.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/refukukelorogulugaraxid.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rigoluzisuralefo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d2fef999---zeteg.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a504f2f020f---magelapipotaf.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/87199010861.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a70171eb974c6936fe940d55ca95268/92394868833.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd08364e51---renavewedile.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/6783307780.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c59a8584c7a---58808118723.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/depametilivaremula.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/99799885797.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160db97be9672d---98199285249.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927672f38cd---mutazarefapekoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+connect+my+swann+camera+to+wifiPDF 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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 17512 bytes
SHA-256: f721d0a099ded7840cfd21c9a9d8246f62383f7399d6f6370d68ceed028b992d
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 10780 bytes
SHA-256: 41d5b79b70c94a82ec749b355138f8bc6927b837efdf6fcebda3ec52b712dfac
font_02_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1