Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1098ffc2d9d04da…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 20:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30845e4cc56a914c248c23ff02b09df3 SHA-1: 0bc853ba9bdd098e58b3a29527d8ea062b6a832b SHA-256: b1098ffc2d9d04dab46a508176c1ee5e45b9f8c67a8fea7eee6d831fcd0145d6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hak-al.com/resimler/files/talibojujajavewalulon.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613024b8850fe---pugemoli.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/xebufoxezovuxajokawa.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/37014162940.pdfIn PDF document text
    • http://yibetter.com/data/files/65654104603.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090210574299.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/tugelegozilogaf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac36d24df---63299629173.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/mafitokobisaved.pdfIn PDF document text
    • http://dogable.de/userfiles/file/35088698521.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/85273282864.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/mirojosimopamovizafuxe.pdfIn PDF document text
    • http://mgrima.com/files/file/67745113327.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3b608a7fc3ae6964dbb0d1c093924e3e/94880530192.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/23504079668.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fcb365f133c811fda32dbeee62b3ccc1/fafefavapiwogepesixu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/94109488782.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/zutoriwal.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ca437bcb---nubusonob.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630613811ed7b3d0fe3ac263bcabd.pdfIn PDF document text
    • http://royalgroup.at/tmp/nelokagejepekivulu.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/10638029398.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/81098436070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=php+code+to+convert+docx+to+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_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 10416 bytes
SHA-256: 8c39e0e3e87d275b903539eac230fd3515ebe6ebe9d70bf756ceda7dffb5bb9d
font_01_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 18800 bytes
SHA-256: 1a4ab157c145b27fe66e17c8f207b1c5a8baf47a5ebd10e8185b5d098f1bd937
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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