Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb70f3e42cbbf46…

MALICIOUS

PDF

67.8 KB Created: 2021-09-05 19:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f96f9fd2cb4085d9a2c811c58498858 SHA-1: f6e7dff038069b2c2a02bb585ee97db19bc29dde SHA-256: 8eb70f3e42cbbf46a26ccce933bba99f6603be6d0b75ed196174aecbd33d31bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tandartsindex.nl/images/uploads/suvewuwoti.pdf In PDF document text
    • https://oddluzanie.net/userfiles/file/wawaloxinowewu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781cbf64d2e---zodanodulug.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a93d00df63---36557920354.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/60300809996.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sukenisidanuludenos.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7jk3b7k01tvps6gql5hmofnb76/falelatitufumumivexot.pdfIn PDF document text
    • https://dm288.rs/slicice/file/12162425934.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/midebevod.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/a0733d7abd728672e0b818abd9ed5e05/17966297005.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cec17703ba4---42652991585.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/lapatikiw.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/nuwamozazof.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/73333615674.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/vikemaboborufepoga.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/89749357444.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/xaxidil.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/nemimowawagakoxusenoxajig.pdfIn PDF document text
    • https://jagominum.com/contents//files/15683719743.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/84302268740.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100da05c29a8---silug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hard+code+excel+worksheetPDF 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_off0000ad00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD00 10544 bytes
SHA-256: 6151fb68b6af49edc517b4abf6e18fca49a296ba6204a42a8bb045d2a900a166
font_01_sfnt_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 14740 bytes
SHA-256: 94fc98cf58249cd412455539829523b04c943416a0f26caf5a8b42b8dcf3c4bf