Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4723cb1b62c1b0…

MALICIOUS

PDF

84.9 KB Created: 2021-07-22 22:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ecd819555dc1dc64ed02175aaac8786 SHA-1: ab085713c633f1a215fa77fef6c5d17ccb92a9f7 SHA-256: 4c4723cb1b62c1b0076d97cd0ff093dddb2ade685933e3efdcbffad76890f0e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. These links likely serve to obscure the ultimate destination and evade detection, redirecting users to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://ferado.vn/userfiles/file/76948567415.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/29f39599344830aaca4e80cfebccbcc8/49390442002.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7384beb0a26f71dd2eb8014390d30abc/84635373882.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8030173b98---karefanedogaxemulepajifez.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nuvorawisafogarapif.pdfIn PDF document text
    • http://jngf.cn/files/file/53605365713.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84f542832---83002218454.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/eea1db92484616151ea4798c6ca8e321/zilapivumujufuparekupa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/53882907365.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b748e891---bamivami.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d90d9d2b1e4---xozonudola.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/80c2ffn6rk4n7c78omfpmrntif/menixowipo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e96303a54---18590563278.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/42486793249.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16096223828683---dotapoba.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/vujabowuruwumezefofoje.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d8616a6c1c---23734913421.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085464fce612---91385421542.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4307460e7---97077392882.pdfIn PDF document text
    • https://digireg.es/upload/10192750892.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/83916687463.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16079b37e5297d---73469444762.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tadipaboxesemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=importance+of+parts+of+speechPDF 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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 16504 bytes
SHA-256: 0d91655fff16918ec3091a7785b1d5540a919e0830b33f13c5bee4e2c6b20ec9
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 10556 bytes
SHA-256: b6126b1aaf9d4953f918beced46ad7ab2a209df2c4fad4c9fdff50beb38f14d3

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