Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a9187ff4734c19…

MALICIOUS

PDF

91.9 KB Created: 2021-07-01 10:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06bf3aad6fca21e04f59c93a6cd1b05f SHA-1: b1ce940333e15a8fde84e9d0e16e27fe45e9b57d SHA-256: 50a9187ff4734c1906981d6bfa1b7386b097c875e86a1f191105422f60ba380d
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. The document likely serves as a lure to direct users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, limiting further analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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://arci-mp.fr/admin/File/87752580084.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f2da3b216b3ce5bebafe6054540fef3f/33054567877.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/50a1c6d3a189810c5cb90f141bd25cd5/51531499357.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28acb9bcd7---46521757257.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/67627580375.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/d197rkdfhggge7migrrvuiln36/19890283992.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/34112478980.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5f3c637bee8f4f92a958187069d8e6b5/31396026646.pdf
    • http://dansensvenner.dk/imagesfile///gamoriguwuvizox.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/n3e8cssqt38cpae2n9r9vjbdpu/10067115763.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8aca7fe6---56711553531.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cgot2cj993lundda9tgb1k0p71/bafenobelakola.pdf
    • https://midasspa.com/ckfinder/userfiles/files/92233957533.pdf
    • http://nhs-carpediem.com/clients/46367/File/vupulul.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069d9aa31f---dogib.pdf
    • https://kompaspt2.com/contents//files/sozekavelowiwuxaxizubetom.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873c1a54cb5---jozonubusafezo.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/timikikuxujiwuwa.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5da41a583e8628af62e301125635c5c4/xavofekudojogenurimus.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210624_B3F2B90D2D138541.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca50f7f745---widot.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc38edd3ca---fofusubudifet.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789506fe0f---dugodu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=black+ops+4+all+zombies+maps
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zovafiravikunama.pdf
    • 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_off000101bb.bin
81100508a40f35bf539426e4cc1e42b25ecd735adc672545eead03d6affea317
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 18440 bytes
font_01_sfnt_off0001321f.bin
b4dfb7611c23addefa280639024d27461ae6aeb6789756698b22e2096835067b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 10656 bytes
font_02_sfnt_off00014a77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 16792 bytes