Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c2b90152cace4…

MALICIOUS

PDF

109.5 KB Created: 2021-09-06 01:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bec0ec36374e008048dd9f6f08ab21e3 SHA-1: acceae355b67075083df897e1527f541c8f7ec98 SHA-256: 6a8c2b90152cace4998b637c6cb9fe30b526a9fa8214c37b4fde7e7a1375252f
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 0.9429

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://salamino.pl/userfiles/file/84486073261.pdf In PDF document text
    • http://belovosushi.ru/files/fukumasisugavizidowevoza.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/c38bl59ldtuuh97ifc6eqjusvm/45801838796.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a279303c47---22977634390.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/55676523616.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d663dd063e---3223960054.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5956ebe93dd6e3437f07025e6c28c01c/natuwijebemiwewin.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4986fa821d8e4a0e2b7c8c792c75c0f9/gumamilazeto.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/69589656729.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c55b69cdd---98889267023.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/xijoruxisebetabuw.pdfIn PDF document text
    • https://emenu.hu/editor_up/lewov.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/775045cf978e2d2360d19e4a66029bb3/40924679494.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/copvqfa7de4pv436r3o8u1ja49/81585430307.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lapixi.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/51057470353.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/90960825712.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e50800cd391160dd100e9ba434227b59/19525786135.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/68818305659.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1r3nrqpda15d2m1ctuqbnvf22q/99108695847.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/wurodovasi.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cb256e18ac0026ca12fd7253610aa07e/7488492332.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b04c18217e48dcb232432689914bea3b/gajatuvadogap.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/74729338234.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612757faebd1f---xoxakafelatexisifazu.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/giguxawo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080409b58433---nodizas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fifteen+letters+abdul+qadir+jilani+pdf+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 11072 bytes
SHA-256: 4851aa85a13222a74cd3444f777c3f05eb1a1a7858c067ab9623d944217b147a
font_03_sfnt_off000150bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BF 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_04_sfnt_off000165ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165EE 25740 bytes
SHA-256: b2f19b8f6615313e749e1dabc56d270b958d706d0c917219691162ece1573d39