Malicious PDF — malware analysis report

Static analysis result for SHA-256 901e8ee3625f39d6…

MALICIOUS

PDF

94.2 KB Created: 2021-08-21 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4513e0f005e97d573403259840151fba SHA-1: 3423a8fdc9b42453dd8a0ed1a17dfaf5e60541fd SHA-256: 901e8ee3625f39d613d7cd5ef3e55b20a0a6a93ea7e219726af7881a1c9106a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs and the nature of the heuristics indicate that this document is designed to redirect users to malicious sites, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zedofeledekadoxugij.pdf In PDF document text
    • http://sequirk.ie/userfiles/file/lilalujijajaroxebegevig.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba42c442b---25970900729.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091965c629f6---98289868636.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/tajuluwisawixiwomogine.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/71099811032.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0p5djgcnal3pj1lm7d1ecen3j6/sizevudijoxapetizikivadu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6a0c5a190eb2ea9877437edee420ef43/89005254183.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vexolomebiruzigipi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c1e40b235653dbe2a11e43fe9d79960f/28908422246.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf879e774---liligafotiw.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/pugasilipavosimedavano.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/88426456738.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/49587223718.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/57426406897.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/wuburu.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/38368247355.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/tuvudatirufufajiwuduna.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/afi61svgsat0famuh7ls49d1pt/zilisovazoxolus.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a582f2d02---donakogabagajaw.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uvfarjesr08vrdb34rs3geio2j/4089031044.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/153082291560ff03666aab6.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xodefigapugola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pes+2016+license+keyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5cde1d87---22620491028.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e160.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE160 22756 bytes
SHA-256: 6f80990c8c27126cc59619f0971921dee1e591bb0674fac34e1babd77a34e40f
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 18804 bytes
SHA-256: db3efad3628a25eb4e99ed5b11c5d337abbcd55167d1f720199973edf490bab2
font_02_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15189 10412 bytes
SHA-256: 4d5b55325817b2adef9100a93b78ad03b28a5386551fb8725191c1fa8d4ce2f8

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