Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f512bc52c5d082…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 00:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b768eccdf5a6ce358dbe80657e692c2 SHA-1: 8ba4bb0cda5997c700bc0dab9a5c40a0308a21d6 SHA-256: a4f512bc52c5d0825669e588f620f349364fec4a31b73b525213819d47be6f15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=pruning+knockout+roses
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/aad904003a4321e4ab3ba81902dd68c0/95889501440.pdf
    • https://chaplains-camps.org/upload_picture/file/59837941252.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7f171fbd---nigegase.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b679822ff1---dokotalevipanufazo.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e006aab2---57976575258.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c26e226a7382327544fc6ab0bd0ec8a1/luxiboxidugixus.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/jabivugukakob.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae73b6f4d---90644079007.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/50105748007.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82041995ef70ffaaa359c6fe2fd62c23/7582603274.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb7e0d8e09---703706853.pdf
    • http://ubest.ru/images/file/ritedanokopukilapozaxasaf.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072daad1b240---69959556926.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmkh3tcakbh0240p6p2t3mkqc4/rowod.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/thuficntg1a35ibfdlmba8qq9h/mimaranuxojasakofasuziv.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a563cf1f5bda233ddbcda1f19005e555/55623583684.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3ea3ba31021cbef19188a8cdf1828856/lexukapawidiwojeboxefokap.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9dc019848343b45c48468c4116742ef5/52060041502.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adb3bb4cba0---pejaruzijuzamujopagop.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608325c1cb526---21024342245.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/358245bf195795da667b4635be5d4042/dubuluwola.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5e086bbd4---9575941960.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n09nhj0ob1381guo4s0o0do25v/49621688288.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160744b954107e---vezukitozefo.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ab7f09039050148754fa967c8ddc3a72/44185899769.pdf
    • http://terezmisszio.eu/files/file/23911689241.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedc.bin
1ee7ea23771615a52d02e121c889ef7b184c0644158b7c17b388be41e1f087e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 10392 bytes
font_01_sfnt_off0001067f.bin
54a53a73ec23dd01c619b2010e4ecee05aba15ebbebf2bfd6d2c17014bbc2890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16452 bytes
font_02_sfnt_off00013129.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 16792 bytes

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