Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dad1cd38428d74…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 15:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 877e4410e31cb335537cf28be5fe6cfd SHA-1: 29d15e1f2a810612b846a073a05fcbb280833186 SHA-256: e7dad1cd38428d746e2f5cc9b5e59d9e89acf07fc94505e96457d9f51feb89e1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns align with common tactics for luring users to malicious sites.

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 https://garglob.ru/uplcv?utm_term=free+fire+apk+download+world+series+2021 PDF link annotation
    • http://lab4050.com/upload/editor/file/35878553574.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/tipusavodutulanotize.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adaf0c5cc0---80054455965.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab28870dd---zesebotuxe.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/tixumawadesixi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xalagukaripetas.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/9211157056.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109161806362747.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/46899008225.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/jagavotoxorap.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/tokuxakobizowur.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/82087915195.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/refuwefegoxodiva.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/91466442728.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/xarixuvegodiledowelezu.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/69073224003.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210914_05F95BEE8E3ABBE2.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/sujemetijivim.pdfIn PDF document text
    • http://mobitransjogja.com/files/vekiledewemugigopitixepij.pdfIn PDF document text
    • https://purefeeling8.com/data/file/vimiligowu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a1b0d7085aa2eb22e08303b4147e1f1d/suliwurakuvutuwixilobe.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/lekenezoxidivowu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/77267839783.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 10840 bytes
SHA-256: 5e08ab2d42c5c7f75c540a3d025ca9f917272642f06ef99f9faaf29c6789f33a
font_01_sfnt_off0000c94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 17580 bytes
SHA-256: 4d82b6c50227144e4fd0a858fb5a43a79f965130187d516c03cec7c238d1acce
font_02_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1