Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b5d3d4a6f6b629…

MALICIOUS

PDF

86.7 KB Created: 2021-08-15 05:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 44231de73aa4cfe6b04e8a868198b70d SHA-1: b3b2d722495e5869b28f7dd50a8d488ea17f2588 SHA-256: 77b5d3d4a6f6b629f7ad8a170f89c41d4caaadcff53ba73b29d9ee8b99a75861
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself is heavily obfuscated, and the document body is unreadable, indicating an attempt to conceal its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://grandchainfamilyfoundation.org/clients/85333/File/suxirosobo.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/184eb1ae0b2cb6718e30e35248828e91/61243057283.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rexif.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/jobimasuwifetivogozipuzi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113032082e7e---lagolegakutewuzibofuvu.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/75431063535.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/85kkrlld4lc2cl2k0hql7qlcv6/kivinopofovuvumuwawag.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ac0637ef---tuleked.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/zojuxavomevowapukazunapug.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870641e983c---gutipe.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/xuwuvazodudideziraribara.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/79mv88o5spopd5sk2dl3n9p6j0/nomusikugusole.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/10248059033.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/68892614661.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9892cf4e1bc3ad33172ee0a6cd5d900f/pevaxeluneburage.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/6571029679.pdfIn PDF document text
    • https://silga.ca/userfiles/file/51615098464.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add527c7479---44260188934.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/54013309397.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/10508948736.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/gewonojepuwibeninurumet.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c7d9ddc61---vuxosopalazitovoxivo.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/babimobijot.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021081106412127.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16103af00e46c1---jitesujazujoxipinifixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=liber+null+e+psiconauta+pdf+portuguesPDF 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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 10992 bytes
SHA-256: e025e5f06494bb4267e4ac351d86794042c0945abe6ac4dfc188c971be7e186e
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 19656 bytes
SHA-256: ea5c000421dffbfa708eaa2fc69255c4f799d14a589ea898e7af13fa91d66fe2
font_02_sfnt_off000132da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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