Malicious PDF — malware analysis report

Static analysis result for SHA-256 67342cdf8e712c58…

MALICIOUS

PDF

82.5 KB Created: 2021-10-05 23:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65a79f7adb8908b36b589917b8a3b71a SHA-1: 23d48910a13d661dcf8dd24c12e8b1b0b9d68421 SHA-256: 67342cdf8e712c58f9534fa515a8d044a46d16dce745e1b6a924dd5561b11e0a
176 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple external links and the ClamAV detection point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=rich+and+lean+mixture PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615427b07b805---52117891806.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/37338251297.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e24464d0db37a698d4b418451e2abf12/zegesopewavadinupod.pdfIn PDF document text
    • http://badgerhillfarm.uk/wutiwi.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/bovozak.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/86749805705.pdfIn PDF document text
    • https://motecx.com/images/file/38334211194.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/pisimi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a44dfa4146042206520b8f7b11c414f7/5179800836.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/gutaberolitab.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/vurugutelagoboludovavizon.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6a9e30db3e2d649ffe38cad12edcf0e2/57659605376.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/dolerivifawuwefupom.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/zixazijoxemuzofupugiveme.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nabuzobajoguvilinujomeme.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/fegulitedokegijiw.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/82283349454.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161372c5592098---77653633605.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/gawizuz.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/17254146819.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/94869067828.pdfPDF link annotation
    • http://www.armstrongre.com/files/files/94131183810.pdfIn PDF document text
    • http://10fci.org/userfiles/file/58963712604.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/37565541144.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10596 bytes
SHA-256: 81242098937cae7de4c633290c29da28c6b6bd83bbc20eb341d9991465aef589
font_02_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 18824 bytes
SHA-256: c65aaf30b5441dfaf2023f211167cd34e22ef4d94f17ba1654d55c381bf8ee5d

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