Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e1f9ede2416509…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 15:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 888065b81712f24dae151478107d6a1a SHA-1: aab39d1cfef1319bd410c440bd18a3f65d20007b SHA-256: 37e1f9ede2416509cab96b64f21f09d640c76f0b0a8f047732e7c921ee30649f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various disposable hosting sites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://m-astar.com/UserFiles/files/60595206500.pdf In PDF document text
    • https://berbagiangka.com/contents/files/86025802468.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/27914529480.pdfIn PDF document text
    • http://rrarental.org/upload/file/sebalub.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/76957771096.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd3316607---kipebuxotimoju.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/76970924794.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/64966949013.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/82342188079.pdfIn PDF document text
    • https://tessuno.com/upload/files/6138f9f6783a4.pdfIn PDF document text
    • http://compsult.net/userfiles/file/81698896115.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/85482284446.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/17099899299.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/pixexoxesagidub.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/fuwasubibubagekemililosus.pdfIn PDF document text
    • https://camelcarpet.org/d/files/lexonugatifix.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9cd2c4f3c---noxuzif.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/1159834516.pdfIn PDF document text
    • https://onlinendttraining.com/files/9383856786.pdfIn PDF document text
    • https://masukpt1.com/contents/files/34738643912.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fab791423---87974221204.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210915152545512234.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/55003822920.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/wisixatepuzipazovemaperot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=freeflix+apk+free+downloadPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/85961689125.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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 10484 bytes
SHA-256: 89d7b7518bcd4ddac2e09987e54a87f7a57b95fe5cc03adf1a5d03065de83341
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 17868 bytes
SHA-256: c6bdbd3e8d00032a2c942f02d871c4829e408354b8f8bf777fbd2898fd1ac856
font_02_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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