Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a98d6824ba49e09…

MALICIOUS

PDF

75.8 KB Created: 2021-09-15 11:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b0a286f85bd6d5fac42ad520382de5d SHA-1: 27eb1db7b0bf46742dc99c8191e83e7cfcbfcf48 SHA-256: 8a98d6824ba49e09eb71a03ba335177024f85de0a50eec3a8c70c1566c970604
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00c1db1d9---35529242271.pdf In PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/69904524056.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/60704569061.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/masejupeketuludan.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614142e9c975b---vusatosodovewitera.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/7042953252.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/jexuwedisi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109082104011322.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/vumusi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613387b710d17---divadejejeranekutot.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/46697318351.pdfIn PDF document text
    • http://minerva-collection.net/files/files/18203101610.pdfIn PDF document text
    • http://bptramptour.pl/files/file/sorokopakevejoda.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/78794160498.pdfIn PDF document text
    • http://hidropro.hu/upload/4660723771.pdfIn PDF document text
    • http://salvamontbihor.ro/app/webroot/files/userfiles/files/kaviwepufigo.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/bokit.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/94587202940.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/40458648229.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tivedotalukusepusovegi.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/79664490475.pdfIn PDF document text
    • http://okun.su/upload/file/kesulasewef.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/81672802356.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/24769485388.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e011c3367e---1490022493.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/79732921122.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/49064638768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ymate+video+converterPDF 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_off0000c558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC558 17204 bytes
SHA-256: 2bdd7ecfb36e0ea7629cd2cea3e7738e550beac0ffe229e56a2e8051942f42f5
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 10368 bytes
SHA-256: a83e91600594a8880accdac19eaa8dfda4b1f97877bf3c7ac99af1b291bdbdf6