Malicious PDF — malware analysis report

Static analysis result for SHA-256 400b9090f8f09292…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 18:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41043d7c1b30b748c17d3af5ecc8bbe3 SHA-1: d42b595c02f87c5d571ca0a6ec22dfb1ee307d23 SHA-256: 400b9090f8f09292986504ed13b7268f272c9c3c9b7bfe3787edfe458ea49768
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting a phishing or credential harvesting campaign. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=balanced+diet+menu+pdf PDF link annotation
    • http://topbuild.net/content/xuploadimages/file/61675159718.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354544a77f2---galuwutumuzidaso.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7995887032.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/44969810172.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/54074939756.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/vikuganezo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/dalobukekuvasitiboxabolow.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/xamezawenejaziberosefa.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/12976615813.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/derakexexofodoki.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/86585889362.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc886e793---lesijad.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/23120690927.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613607e824555---xifub.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/32752337345.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7998f43d5c3e1f07b03ab680253ea356/numesamopodurekimesibijig.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/dejetudasukofe.pdfIn PDF document text
    • https://rippa.pt/files/file/sexes.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/46355651046.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109011117508238.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/jatezuwuvaxikinafu.pdfIn PDF document text
    • https://onecre.com/images/content/files/73181833079.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_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 17724 bytes
SHA-256: 91abee1fb06493da35c464710a67f4c8ca1a33918e137c5207e201573b0a212b
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 10544 bytes
SHA-256: 6f8558c027045e93eb77a83ad21a608fde04f454235b53b387acb84a8849bab8

Open this report in the interactive analyzer, or submit your own file for analysis.