Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0d3813d1359d4b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 14:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24fe27f9646d660a0d58a72fee1051f4 SHA-1: 37599162b585947509bddf0a361f5ebc1f9a73dc SHA-256: 9b0d3813d1359d4bebe798538d5ed0c338f61ba52d8ce3c2757791381a86862b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the attack pattern of leveraging compromised infrastructure for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=un+americano+a+parigi+score+pdf
    • https://webmakler.org/userfiles/file/gogewurolu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b1d9a742---rosemubale.pdf
    • http://kjphotocon.org/data/userfiles/files/95463268310.pdf
    • http://dztechfin.com/upload/file///40150218944.pdf
    • https://responsible-tourism-alliance.com/content_file/files/77887303564.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7057bc503c---9599260476.pdf
    • http://fioredda.com/userfiles/files/19033517708.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/f1omovqim8qpu6e4h7rpitik56/fusixoxalalotisuzulaxame.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/kenaxijepilivovezajo.pdf
    • http://www.petercar0937494634.com/upload/img/files/25948633882.pdf
    • https://proetcontra.hu/userfiles/file/88729692648.pdf
    • https://osikovo.eu/webroot/img/content/files/53766844433.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde38200c01---77103070799.pdf
    • http://ebslang.net/_UploadFile/Images/file/vixunolijupozefamilu.pdf
    • http://ocvitlucky.com/vietkiendo/upload/file/ribepoduxop.pdf
    • http://mabo-meccanica.eu/userfiles/files/54570472189.pdf
    • http://hysansam.com/fckeditor/userfiles/image/96387949523.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/xovoxe.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609f066852153---geveb.pdf
    • http://fine-cottage.ru/userfiles/files/raderuxuramila.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/ripezinobodijinu.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e986567de9e---55178402667.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_off0000cd6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 16792 bytes
font_01_sfnt_off0000e581.bin
d4562eb335d891055efdb9f0126cb9d2ce1a77606ba09e35e44fbcf25d1e0a42
pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 10828 bytes
font_02_sfnt_off0000fe2f.bin
bc0e4ce72aac8d52aeca03238b9d36c4b5af4f1a6b6d856a12f1ff58c4d8c686
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 18976 bytes