Malicious PDF — malware analysis report

Static analysis result for SHA-256 da64d0e6cd915a32…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 13:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5dc1e88ffd5a44b4f66e384147799a1 SHA-1: 38047b620a45610a6e983cdf80b85bbeac52cd8b SHA-256: da64d0e6cd915a32d4b045ed28eebd23dc3df3e4c977694c5781f9928806d99c
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 as malicious, including a critical ClamAV detection and a high-confidence ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and a link farm on potentially compromised CMS uploads indicates an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://commune-bourre.com/userfiles/file/rijofoxibojajotilojab.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/40faa1fa07f7a9b6c9a6f55d9d7dbb0b/29076076129.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60e78cfa6---fofijurudimifofanikag.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/49350962514.pdf
    • http://acrclubinversores.com/files/galeria/files/3108116696.pdf
    • http://ingpoggi.eu/userfiles/files/96281477856.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/27839351431.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/o45nhagdbp4sm4n8h0r5st4evt/68055754027.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/ritavawufarimunodigona.pdf
    • https://media-get.ru/userfiles/files/56543533701.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/gf6fejir6nmfj5qknruu15l55f/36955151242.pdf
    • https://villatoscana-pi.it/userfiles/file/56687665609.pdf
    • http://fritz-fahrlaender.ch/download/kuxobagunisupunog.pdf
    • http://studiorapizza.it/userfiles/files/wabezevuwurijo.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a700c3eda43---nevavulodumugafedasokukux.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/84ca1b6e40d6d1467fb19d99bcba2386/77133303326.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/93585821897.pdf
    • http://qazaqbanki.kz/data/content/files/51045548646.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/87416528132.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161147d84d42db---37653738143.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/60910336720.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6f1475c2be0d907f885c0eefaac323c4/lotigowumox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=black+forest+recipe+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f201.bin
bfb5ea2c767a7c106acda7d3d16abd7b3a6dd24d02e017a89a39de5898e4c2c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10656 bytes
font_01_sfnt_off00010a95.bin
10e5fbac7679035d21456bd4b625cbe70e7e38dd07c0b3cdba5f92fc11271d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 18644 bytes
font_02_sfnt_off00013b1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1B 16792 bytes