Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bc9a1877eaef12…

MALICIOUS

PDF

81.5 KB Created: 2021-07-05 16:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: de4bde7ee1a0811e035cad5b545adeb6 SHA-1: 9c19586c5b6d2018bcbba73f7691cff029d3f2f0 SHA-256: 15bc9a1877eaef12c6b04d15e97dc60a482aa31ccf5f188317bf7cd7e48d317b
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. 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 suspicious score 0.3290

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/serafiw.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70cb92c75---39057464153.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/34118969402.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f1e51b9a076f03e0e6d8ff9ed8b06708/melolatagivedexa.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/42241674502.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c25fd04a0261b0cd3e140250fbf2506e/venitaxa.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/93625162592.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d3596d56aa63ec7106b59ecd33af6586/pofafuvexulod.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/44c96193efc1e0fa1695bfcc3263b967/1994534323.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ad0addc1---48530176111.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/986a9a422944b9fef4f08ece43a754c9/dojoda.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609033370ebfd---pejirodusufewotubateboweg.pdfIn PDF document text
    • https://areicon.com/images/file/58912852092.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e839c75b1---gisabexavisinoli.pdfIn PDF document text
    • https://edarky.net/data/file/45451483491.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f26c68393---95391329363.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c995f2e56ae---3541729566.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/noboxobinesuxujobiv.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b7372ac09451145abc200ee19692c8f6/lonalabeterebumos.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fiwazenu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87d320cff---78168898057.pdfIn PDF document text
    • http://sns.hu/_user/file/34472568408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=things+that+rhyme+with+rudePDF link annotation
    • 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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 17016 bytes
SHA-256: d9d1ab500365bb6da0ad9d3195eb8f6930820ad3108f550a8871940406e44104
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 10792 bytes
SHA-256: 806ad16e75673b62a202ac3190ce13ffce39917247cf88f2c0cf3711e2c1a894