Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2eaeebacc6ef9b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 22:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd445e1cb3406ec3e3f0c1d2186c78e4 SHA-1: 36f181aaac99da9f5de148c45f68ba44f41711b8 SHA-256: 1b2eaeebacc6ef9b0266a00165e18e91a2544c18ec249ba9e12faad43717e393
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://kermoulin.com/userfiles/file/35561842420.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423284986c8---bawokijetod.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/fegad.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/21065455146.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210912_210452.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/92873824113.pdfIn PDF document text
    • http://househouse.it/userfiles/files/55753918901.pdfIn PDF document text
    • http://czyxchem.com/upload/files/81478118034.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/84245341170.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/95222774522.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/dizevufusuvosafutepok.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/rasulibirowe.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/71627539694.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/goxusegexoki.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/japaralosiverozovewi.pdfIn PDF document text
    • http://primaneighbors.com/userimages/6278167774.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613109927c8e0---34824341796.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/diwaxenarogapodojopitiziv.pdfIn PDF document text
    • http://agmapure.com/upload/files/70510946515.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/93721206782.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/25603279988.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/k5ct5rq439gl0aavmhqnrs6582/20952148765.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/koratesadodane.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/boviwugawifunorajaf.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/pomejojanubopudike.pdfIn PDF document text
    • http://capital96.com/userfiles/file/97484816312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=real+rc+flight+simulator+hack+mod+apkPDF 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_off0000b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB184 11200 bytes
SHA-256: 46a6a736162bb63d3ac1e0cb642fb4e447046b8510a8047277d1f9d8090697f2
font_01_sfnt_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 17324 bytes
SHA-256: 114ae7e0f46aea8739549e1a5a4699bfcdbea20aad77a9febeb1fa3776c08529
font_02_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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