Malicious PDF — malware analysis report

Static analysis result for SHA-256 e532008193bed314…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 11:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 547c8db526e0f52a6c9279a3fbad3375 SHA-1: f6650bfccf92b01048faf27fa8a81ea591502575 SHA-256: e532008193bed314f800351ea38d36be398263d1e6b6fe2e83ea097369e1f953
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/f84ac6b6a1b51b22e089e2101e6f6aac/vidabovo.pdf In PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/85491262369.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/hcdcsm6cm7vf1vv7e55iud83a1/tutakupune.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/nerizakuvunususinaziz.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/mameradumunepije.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c2de61329f7261b8665a15660ad6e633/fusijigogukipozena.pdfIn PDF document text
    • http://chinahongji.com/d/files/3476421465.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cead77eb4a---81432621489.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/nogezijefekujatatulibe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092659c705fd---gividutawujuluvapiwinoza.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da668436a4---vilejavodubate.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcfd24bb1---lazuwipegefazijiragizu.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/jafadususawalodufowukajim.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/98963137966.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/12938406117.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/593a6628292a7b1d2c5b695c2da6ca56/13781854474.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079c3a4321b2---66708392800.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qlat45qsavf2vfjl294kfioqn2/tanizirufedesem.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/goxomemijemetivadakijuba.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f3625b968---pugulufi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/27b5f203c5927ea5eb05f60342fb281c/niwukenaw.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/75314260117.pdfIn PDF document text
    • http://fructusartis.com/i/File/kerezozigavabirapalufubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=silence+of+our+friendsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 17112 bytes
SHA-256: 8f02244a6f88e3b9e6c7a0a6eaca957f387df45a37fadc29934ee8b347c7440f
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 10384 bytes
SHA-256: 4770936374e4cfc51ad6c3d5112d49070c6dcfea0a4b07ffcd8d9383a92a1f87
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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