Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d53e7f32fb6ca7…

MALICIOUS

PDF

84.8 KB Created: 2021-07-01 00:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 498b14ac406cb934484d4d08755f2e41 SHA-1: 2b73683c7c03e8a282284d131b6e23b4470fe165 SHA-256: d8d53e7f32fb6ca7ebb76504a6641a92bc163a2f5cb8310e514029064cd9bb7d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links strongly implies a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/le6jmqr82gsm1mr5t2gqsdddc1/44214456750.pdf
    • http://adaviestransportltd.com/userfiles/file/dejarila.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623db9e57b---61750986121.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d9b2bd12---fozuzazolezudug.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b4eaf3ef---86319408032.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/h31qq9t5306t56quk5eke6mp8m/fevajezegaw.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd43b78d2d---1781780874.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/92730849978.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ncv5kknncg0nqitspvk04fu7vn/pexalagezizibutupijiwazaw.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae5c354f5---sevonosebigufojoboxiviram.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/49711600519.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/dekefafuniwudiromakisodi.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/zojivivewovimufud.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54453fbdc---rudowo.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/f6c884cbc9b721ecf78323ee9ca5621e/debiximopukifexamemuza.pdf
    • https://acgroupenterprise.com/userfiles/file/pawef.pdf
    • http://ministerium.pt/files/numekowinaxiwesoxevaru.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/04d2707f0518e961df81c8fa5693e226/89692126335.pdf
    • https://akita-inu.lv/www/files/files/laponivodibusared.pdf
    • https://alteanetworks.fr/img/file/96879462886.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02f8ef336---nufuvuragipupofaf.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/27f6010cca2a75acc1067194674925d6/73222730303.pdf
    • http://rialta.ie/userfiles/files/20474679553.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=inequality+graphs+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 16792 bytes
font_01_sfnt_off0000fdeb.bin
4b38c1e44dc05674b142aab35b580b8c0972e5ef3ce63dc470e4bc457c080d29
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 17704 bytes
font_02_sfnt_off00012cdb.bin
42dc0166d85241089f4d5b08a10077b8c838275c3122dee8deb4a18d01692dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 11020 bytes