Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5699856059dd6a…

MALICIOUS

PDF

90.1 KB Created: 2021-08-26 21:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8bb138fc9145a5c239199333c242908a SHA-1: c308d374d8df95189bbcc09960a76576c50083f9 SHA-256: ec5699856059dd6ab5b82e5cdb23d5c0561050344145fd81a14ff3d7fd988755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://scsychem.com/upload/files/74635041345.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/merosavoninoja.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa707f2ec---nonizojurewolofugevaf.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/8844b52fdaca48ef526c32f7f82d5afe/dubewulalarifudafujirem.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/57329597559.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/26918668065.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/tebesafer.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b03c1a39ef2a6da654d9fc7c4296bef/85360098201.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/17419913164.pdfIn PDF document text
    • https://actor-conseil.com/files/file/luneralolikizitosokur.pdfIn PDF document text
    • http://chayka-svg.ru/files/koxasofawozi.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/29334587903.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c354086416b---61923969146.pdfIn PDF document text
    • http://abwrva.com/uploads/files/54754009016.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aedc8829b---37982434427.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e56e55a71bf---75016832659.pdfIn PDF document text
    • https://questyme.com/userfiles/file/fobukiveburotuzuw.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/98857053940.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/62175444508.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/46970070467.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/bizusifamotug.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ponifemajumowuk.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3acc83ee---tewasotijugareli.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/jixuzobajeduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=embedded+software+engineerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 2140 bytes
SHA-256: 104cf38ac5e21918fa95450ec333ec6a488f7d5f4aeb94d6bb0139df14cca9e3
font_01_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16784 bytes
SHA-256: ca4aff05c71bd01050ce82f7b0df9793aea7a1af104377444b645678f2bfec3b
font_02_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 10860 bytes
SHA-256: 322e6d080b7cd6afde05db5c033d2e8d093a91ae89449b4db1c953cd3856bde1
font_03_sfnt_off00014256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1