Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceecf77177e5de95…

MALICIOUS

PDF

71.5 KB Created: 2021-10-03 13:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 28f9cc3d949ecb69ef86667f804a5627 SHA-1: ee2926d13f50bd44e793f3a3d54f54ee92816069 SHA-256: ceecf77177e5de95c22b42e16f738a4de729871594970267cbe39c51cd3faadc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate the PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://barahi.com/assets/userfiles/files/34430361812.pdf In PDF document text
    • http://gzhangqin.com/uploadfile/files/54295571847.pdfIn PDF document text
    • https://atiksigorta.com/files/kuvufizisovizuwupuna.pdfIn PDF document text
    • http://citranco.com/users/files/31431502157.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/37983625965.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1751847246612ef34756590.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/mamidazopofisidigun.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/jedexumipulomajawopavix.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/69190314059.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf269e61d8033a39e6fa19486b5cc78e/17960643496.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4c9b97a7---36399543792.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/88073463878.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/wapojezoxi.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/96632609103.pdfIn PDF document text
    • http://thedreams.cz/files/girurodikon.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/gabafugo.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/kuxuwogudenuw.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197109343224.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/77153543867.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pevizimeboleruf.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613766315ecec---60176607109.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109250504578001.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/musurusabajimopusif.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/wisusalofe.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m6f298cruj0lnlc7kq7t5pav4k/75544304391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chemical+used+in+manufacture+of+plasticsPDF 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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 11016 bytes
SHA-256: 5bbc0bd77620fe473e5011c28434a895bb29d452525dd4f9adea5408b8f4ef4f
font_01_sfnt_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 17332 bytes
SHA-256: 59bcc14b197465884c0e098a0ee520eb3af07a47836fea50a8cb30122d864265
font_02_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1