Malicious PDF — malware analysis report

Static analysis result for SHA-256 880f8c3573acb17a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-01 17:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 093441e6c9b5bc4bf371df258dbf74d4 SHA-1: 3c0b8fbc246bef1e6108349663e020c4c5b8ea5a SHA-256: 880f8c3573acb17a7b028e42efac61e7e35d917450262dafed73a3d6e3a6296a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including malformed streams and links to algorithmically generated URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or credential harvesting by redirecting users to malicious payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed081c2879---budawaxe.pdf In PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/39762797390.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/fpt7r11psb0kf4r9ei407t6q59/nubes.pdfIn PDF document text
    • http://vejwun.cz/images/41123093893.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/lejubavuxuxokivavitiwuto.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c47834473668ccf0ce37024dfcbd51c6/83540768876.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/lotakonunivulemum.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c6ac14bf---34490248051.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/90384707857.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e6792da5115---18916999763.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/41189968976.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/232d27e8f381cc963811464ccaf30d5c/91743429189.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9e1f2c36b---rutilelorugofe.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/xidawukor.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/nexipap.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/mifebodiwebajikapul.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/satavutotuledimuvogifago.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/52516946710.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/24248555275.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ek0bcdrf5bnuhds00442mfgt5u/mevaxi.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/63053522915.pdfIn PDF document text
    • http://dnepropress.net/files/file/kugemubopewowonefaxasose.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/28394921723.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8410224345.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e9mf97bljku9vj3l39pbnf2bb4/70014636667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=change+colour+of+an+image+in+photoshopPDF 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_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 18196 bytes
SHA-256: 122ee011d88f90801c93257c2578f7c0c98d7c5c60d49a7942e92216771a62e2
font_01_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 11056 bytes
SHA-256: b9b14764209d6dc30f9a3ee09fff716dcd7f66b2d2dd42a8ef5fca65248b51d8
font_02_sfnt_off00014428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.