Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a606bf4caafa912…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 15:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eadab0c96677d1c7d047576095214476 SHA-1: be39dfa88158a3c393b57399ef0d959bed3ccda1 SHA-256: 1a606bf4caafa912603bd1533cd3ee6222af8e88d5080f44d91653c5c2d8a9af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://imoroz.by/upload/file/jabefole.pdf In PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/sapagoxa.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/duxiradarasim.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af02d9d247---dinamolu.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/20568685942.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/32266158295.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0cbbed1af3acf8c2e3fda08fcc73e125/69202906362.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bdc41cf52cfb7e6ca5d5812bfbbbb976/mipewefeduxo.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2ad6b0062bf4954c07589b17b6488053/7525777449.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/62360197748.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c80f12b30b55262f6952f1e54850122b/62648158863.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zemekuzifupasivemi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dlm8aqki6uk44rt75bdn9r64ob/fugura.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/79800614764.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/78469265799.pdfPDF link annotation
    • http://mp-journal.com/media/file/58131014795.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f9c55225---40910616339.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f600f41bbf---minisobokusurimuzefu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/cd22561efc649bc470983a3933478c96/73508510519.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/10083634657.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/xufaxezorojerozotepek.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/28359705921.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c144ed4f50---bixug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cbt+and+psychosisPDF 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 10616 bytes
SHA-256: e52b92f66453ce444741f49bf2238f5fd1d1d32a7475ba38aab6f0ff1afb0fee
font_01_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 18016 bytes
SHA-256: 170ca1960e3e1e0b0a5d35a925468589cd03b010e3e630b272e2fc8c8ab18d36
font_02_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1