Malicious PDF — malware analysis report

Static analysis result for SHA-256 724855ddc6c20bb3…

MALICIOUS

PDF

106.8 KB Created: 2021-08-18 15:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7225aeed7fc145067f2d8a0411a3481f SHA-1: f4894460869f4fd6a9f3f6df749d12bf8f2e1704 SHA-256: 724855ddc6c20bb36bd8da45fe2c90c3f3e47d98c7639bd624b176e2dd651059
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840e8a06266---7459426413.pdf In PDF document text
    • https://marosme.ro/hirek/file/69940782258.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/nojinotifafiwijeba.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/detobokasun.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4q3o4dnqdk7jvtq1epql616ag2/40028427729.pdfIn PDF document text
    • http://pasted-radio.de/web/files/buloziwupi.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/95901668465.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/79615492078.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/26018712449.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3feec0962a830a5563fb7ec3a892ec53/xozarusif.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/98938068574.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/53678662848.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/37618077321.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/53973427436.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae64d6acae7---fotejojulab.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/laponenuvokujofalezo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5d6103fd3f41fa52c7b26ef865205517/64373668804.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2362686826---7327156031.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/juvefoforalobamameda.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2f059ea3---gogojabin.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/57079294231.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/90122830399.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16088be79d38d8---kekabiger.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/2267267915.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/japak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+long+do+earthing+sheets+lastPDF 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_off00013d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D43 18980 bytes
SHA-256: 68ca5b8f263846b419d7f0952852938da1e5d31916c1de5dace7fa3f6beee7cb
font_01_sfnt_off00016d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18530 10604 bytes
SHA-256: a3ea0c4a90b78788dfc1f6e08e9499a7755c0f16a56e9ba81c7d395e89a7ebfb