Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d3e2764ae92612…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 09:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0afdf153a34f5592edbb319c3df2d35a SHA-1: 4cfa3d27826eb707fbdbb351b43d0f1d7f680eb3 SHA-256: d5d3e2764ae92612dabf3c33cb23e407f1f2983cf0fbc34eef5e2f9de27156a5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=alien+apk+download PDF link annotation
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613411017d8f9---rakozurefozigusidir.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/68380630179.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ac76f661c911cba0e82fdb10187e30a8/kapemenizilufuwedaxosif.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/tuxodegepe.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/likup.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ketakulivafefexosukimutip.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/xereremukoduti.pdfIn PDF document text
    • http://mayjack.com/upload/files/38383082702.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/vexokulogetupolix.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/10625927988.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/fipakomesurugajilo.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/18848930685.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d52e034ae95509808090ab91d6d6c25d/82241391012.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/48098433252.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/55951161973.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/vudozixose.pdfIn PDF document text
    • http://labsshop.com/d/files/71243529206.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/19287728748.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f887ad1cd2---64410513375.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f980c35b---pibanepinobositikowekone.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/64001485773.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vizotonuzudibobe.pdfIn PDF document text
    • 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_off0000b9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 10176 bytes
SHA-256: c976351861f29ca0ebe27f3c23b29f9fd8ab08af77136c699e1f4cc8a8909051
font_02_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 17264 bytes
SHA-256: feb030e24a7d9402885ed857287fe90976d45762a44649a774cd3de2296c4821