Malicious PDF — malware analysis report

Static analysis result for SHA-256 d789c795dee7f3c9…

MALICIOUS

PDF

87.2 KB Created: 2021-08-03 00:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5c4340e670017bd6a2c25605cb77db2 SHA-1: ac2bdebacd4af7dddedc9456f7d8f17641f22b40 SHA-256: d789c795dee7f3c9c4a1b7afcf7abd5eefa2ddc23e035e7d141fa6f98184e4eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to obscure malicious destinations. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' indicates a phishing or malware distribution attempt. While no scripts were directly extracted, the overall structure and heuristic firings strongly suggest a malicious intent to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mmckno2010.zkosuchdol.info/files/60461599473.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f7d8e8ce45cf8e05749b9cbbeec96a94/zavilumijadesomemiboz.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/jobawuzapokunanaseded.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/86286234998.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/wuziwedanu.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/ditudigowabolavoz.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/potaxivoradi.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/fexolekavi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e6217cbf---24027894329.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/wefobesutamidararaze.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db257c2c8300a6fda355f8b927b5c240/xavoniziralarobu.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/88066880349.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/67517038882.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/7a0rgndq4mush56ngpj1f3bcb2/37561252091.pdfIn PDF document text
    • https://termofriz.rs//files/wawiratoxaroponiterunoni.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mogm39sv0ggtd1qiugo8nr403b/22448357917.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/85343390717.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e9c92c282---60609128624.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c0f52b4cb4aba48ff185c67faacf5eb2/96467619539.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac42ba7c5e---domuxepewudefojavutoteso.pdfIn PDF document text
    • http://alkanboya.com/files/file///dodiziperolonazaxedamo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/14491779244.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gq2s36qrshtbkfl921fn7vrgsi/maxexifaruxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mba+cet+previous+year+question+papersPDF 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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 17368 bytes
SHA-256: 3e3f01a53883ff13b7cf37b87d8f9ba8409b33b2a12c9769aa9ace291848facd
font_01_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 10880 bytes
SHA-256: 6cf3acb2187fc0881c5efbfe348f7e1e77ee39e38aa0b5aa7925d6747c43c0b7
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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