Malicious PDF — malware analysis report

Static analysis result for SHA-256 885e4450a2d4b5e8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 23:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f93930b65f6fbb86a1788bcbf063d446 SHA-1: 87d76d478d4546c46f17e4496c4e5d639068bcee SHA-256: 885e4450a2d4b5e893765212d6e0cee60db774d14dc461ec2c8012407180eef0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=gta+vice+city+files+for+ppsspp PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fecbdaabaf---55033070757.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/4538752209.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/xuxedenabotivebumavof.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/temowodevanavofuxaza.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/65178518355.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/jilabixorufomam.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fejufuwozugozafa.pdfIn PDF document text
    • https://kermanrooz.com/img/files/tifilowafurufesalisaziwe.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/84717163298.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/javafatosezudegivofimexev.pdfIn PDF document text
    • http://toroisg.com/public/images/files/10602755754.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/76740290977.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6cec6c05---suzawinonuf.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/pewigamegotofogeteduka.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/24852802025.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613108148838a---53780058768.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/1627855520.pdfIn PDF document text
    • http://wernitznigg.at/files/38639232982.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/pitazikin.pdfIn PDF document text
    • http://topflexsports.com/uploads/34072216582.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/9535998067.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/81909048902.pdfIn PDF document text
    • 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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 17008 bytes
SHA-256: 8ebd6aa8d807a34c6e9eee90c5206d0ab4b73af870d7052da3ae959c1a4bbf25
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10588 bytes
SHA-256: 2e869a2ba65c1581f1491a7ae1c674c27ef95527e2a232978c76e80d3832bbe7
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1