Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ccb11b2e5a6507…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 21:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 404fafddf15c2fcc1d2f7441fa47b2f3 SHA-1: d6405718d45dbfcbd0368401e59f7d67bbbcc405 SHA-256: 05ccb11b2e5a65073fb97e290bb128d915016313158bca97310f7f1304b36d73
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised CMS upload directories, suggesting a link farm for SEO poisoning or phishing. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external links and the nature of the hosting (compromised CMS uploads, disposable hosting) indicate a malicious intent to redirect users to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hk-keber.de/images/file/zuwotabef.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/purafawemanupo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a48721c09cb---90188470127.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210608044151.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/80421635333.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65fb1ee390---fidivaxunudamolev.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/21184460837.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/37283233370.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/mavuwupovogikafixad.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608256a795a84---15619821410.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/narolubatimu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///92138217531.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/tovojuzomaxid.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tietalbosp1bvqdhg2h8k6p2p0/5235712955.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210704_1262059D3D32E8F1.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/47558856247.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/46184740714.pdfIn PDF document text
    • http://hydrem.ru/images/file/53790353829.pdfIn PDF document text
    • https://nevisnews.com/userfiles/toribokezo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788b71cd644---zedanukafetobarizazopeziv.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/wumopakuka.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/23484494946.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/zasivod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=neon+icon+pack+apkPDF 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_off0000bddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDF 10024 bytes
SHA-256: d2dee63951a90e2ef4e6ab5c03dc4b1c1cea4d92066fd780c16e8bcab6ab4dbd
font_01_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 16576 bytes
SHA-256: 7c1336376299ffefed1a32ff5615ba41132bf03764b36420022e470065ee6517
font_02_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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