Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff7ae3041cd72d8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 14:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa4a184a5796e3b834e2d3b29ae3e201 SHA-1: 15e2c3d93ff6f361b87cbd3940364cad7dab2ede SHA-256: 4ff7ae3041cd72d86552c42401aca7c17655c962b0640023ba58b113a24f4b1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and link distribution pattern are consistent with a phishing or malware delivery lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://fritz-fahrlaender.ch/download/4992026442.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd68562ad2---zedorajonarepabewurifixa.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210806_051117.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/sorokex.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/powim.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/89621817590.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/kukefemenugovakij.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944410c5aa6---43263663602.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9dd4dc9126---xoxesovolojedalelomo.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/70747648195.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/55832709892.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/41845390049.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a29cd9a94---poremibesazisorefames.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/phb5smfcg859s37g81g47qvja2/47724227369.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/b021dvrbvkj2l47ip5ml2no2ht/lomaroj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4154cbf65---vifoke.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/742a8c15c1e393527d2619cacae7aa0e/dizejalasufodudi.pdfIn PDF document text
    • http://airmon.hu/images/files/dewadakakapelemijitos.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/ritokeso.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaaf7ddcc2---89314131097.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121984e0806c---50661400706.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19504a0b8---2689358864.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/65921382158.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998f1b30918---ridesunatemaranuge.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9784cbd6c3---27715231591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=banking+services+chronicle+magazine+pdf+free+download+2018PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD3 19996 bytes
SHA-256: d96c1b62827c387694b0831a7274448fba58c17d0d0652c12343d3439f242d3b
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 11828 bytes
SHA-256: 2c5931f337513e066c6ec7e6ce75768559cb10e3c56cefe62fce3785a2d8aa99
font_02_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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