Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b05b15094b0dbc6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 12:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24686e13c77b5d871434b6870a44020a SHA-1: 724532339639a751b1b20764e83630a1494a248a SHA-256: 7b05b15094b0dbc61ba93d39746a5f181d3bbe2404432e6057d7c40ba1cc5c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

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 http://panda-es.tokyo/yamituki-n/uploads/files/19848199685.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/51114850554.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/niguragizabise.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/wudebitateba.pdfIn PDF document text
    • https://kenadong.com/contents/files/godinikefiroruwu.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/dediluvixugi.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/nilenesiratuzalimubiwidu.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/92012878231.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353afdaad47---wogigipopubigexibilejuwad.pdfIn PDF document text
    • http://turnyras.lt/Files/file/ropiwojirogetogorul.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b427bd425518fe96fa19cb05ef289edb/31632931349.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145727bc5af5---runoxijedononos.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/zabunuzukigazitifo.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/92941498358.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/25488333346.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/mafubepogemusavegunogu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/falefumutime.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/21391988639.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/74658931965.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/44659680939.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/21389978538.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2qnqtesjkll0i4hl0rsoaaejmq/43024017543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=stop+app+using+data+androidPDF 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_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 18400 bytes
SHA-256: 0d1078deefe22c325495dcdd26aefc5ec5086c6f4e1b2b24d45a7482d5db351f
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 10564 bytes
SHA-256: c26f99c2f30e6f7b9fd0f69f446aca456e74a30458a897f201fd0c0f9a67c7b0