Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7729cb39026679…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 10:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21e8cb2a595bd9eec3f4ccbc4884c945 SHA-1: becc8bcb6f247c791a137cf53accc65a593c0858 SHA-256: ed7729cb3902667902c5a36e531db8796f8a1d7ca34dd6f3691e67bd930f3ea4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://emachn.com/data/attachment/file/28745366527.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d5715c464eo3k5e6k9cndc68k3/nujerulefimusiduxixelel.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/61007a5b885c6b30538ee5fba79bca60/86657099467.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/19501843129.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/62700270534.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/45978450866.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/80142319936.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/57381057750.pdfIn PDF document text
    • https://noddy.nu/images/file/wimewolinura.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/jorexobaparemawutomiz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142e52076598---noruwakazugenuvutuxedelob.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/zajimokadok.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/39573231315.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/woxuwa.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161494f31a5766---renuluduxox.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/27390565621.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149640b2085f---31967215863.pdfIn PDF document text
    • http://1carl.com/userfiles/file/wowonagofi.pdfIn PDF document text
    • http://innotack.com/userfiles/file/43434293127.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f80b6ae106676a920196c20edd7755e6/53478089751.pdfIn PDF document text
    • https://slotpt2.com/contents/files/fakemajuxubetido.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/notazexemerowiji.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/rizavepipejolewufezunawix.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/mugenanosixijepe.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/19981231966.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94789073980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+phones+without+bloatware+2021PDF 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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 17164 bytes
SHA-256: 53b6c64741512824af8142df9c069b70d073dcfab34a0b71a173a30e70e9cb3f
font_01_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 11088 bytes
SHA-256: bab450f4de6e697e70128986324c7c6917b4550e9fd1fb407eddfbee96d436d1
font_02_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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