Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a7dda7c095b6bb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 09:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9750533302b0746acf7935372d055a0d SHA-1: 1384069efadbe5bf56a165a4e1fc01e0b312c9f3 SHA-256: 10a7dda7c095b6bb80919a1dd40b1205026018e0489853c8680555966e2b21bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://njxinbell.com/upload/files/5534597181.pdf In PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e1d3f4a8152cca5aaf5170f9fe638fec/83297227535.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/56118936548.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xetejemosatonaduvorekux.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1b4ca57c---vosupajakakawukok.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/favifegud.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/xutonuzuxibuferoruwovuso.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/duzosoruvigojovu.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/bugazewapegobabalisufif.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/luzosijulelu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/af5ac5f78c1d3264dd4dc524690cb07a/bexogusokuk.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4f132981---bulivumewefovebuxen.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/32372728800.pdfIn PDF document text
    • http://pasted-radio.de/web/files/20939251549.pdfIn PDF document text
    • https://anfauglir.com/images/file/jadinakideraxofoxo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071827ecad18---xelewunenuwepogamolu.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/91307e179a5263643280bb06d1872241/xidegodos.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f781d0e7a31---muwutudenufopotet.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/83882613477.pdfIn PDF document text
    • https://tigaintan.com/contents/files/69319538185.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/57432dd1fe9e3c7d22ecadbd8e3cee93/36670206740.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/51812870904.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/36757424137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dzogchen+meditation+pdfPDF 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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10812 bytes
SHA-256: 3263446fbf57b9eb4a8c60419e1e6b0064caff47af699ff4d58f7a468bd70719
font_01_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 18384 bytes
SHA-256: cf6d9889fe7f2c6893f418a9612944f8eff8fac36e82090b9bbf382a514f48c9

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