Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78003116f2a5ff1…

MALICIOUS

PDF

82.8 KB Created: 2021-08-02 03:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31460caaa6b93aca40fbfb94cb643647 SHA-1: fbb8383ce22ff4823daee3f015351503a0ad169f SHA-256: b78003116f2a5ff18907b65b67a07b25aacfdb2d23ee62a8480edaef54b1b143
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, a common tactic for distributing malicious files. The presence of multiple unknown URLs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. Although no scripts were directly extracted, the structure and URL patterns are strongly indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe03ddc6e---zimemuti.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/36910897070.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/92105110785.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/13170153322.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094061e6ca07---woxetomafabuvefurufez.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc917e07ab---21715475013.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160720deb2f4a1---12836918729.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c932bae315a---nezodid.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfa7083c8d---37248578105.pdf
    • http://nedirajtebosnu.net/userfiles/file/daxamazemaluxomexo.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/b6rm8kh8j90hfer8f9vrvhgvd0/pifowuvedokupelerenane.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2f362d0f0f75424a3ec9061e676d977c/fevarinimet.pdf
    • https://securitydm.com/slicice/file/51091409834.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b0fa294e109c900e72e35a54d90017fa/zebivujabufozik.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b66e7ea616679211088e4baa76f44110/nanumewokivuzotadis.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7utr8cda5qqf1gib99e1q6csb/jukikudunus.pdf
    • https://b2cexpressdemo.com/userfiles/file/nilabixogokemat.pdf
    • http://dichvuhangngay.vn/uploads/image/files/13915263782.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd71b6ec2b.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c029eed8---64138697216.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/finuwidide.pdf
    • http://soupworld.de/upload/file/ninuwililijavonijofome.pdf
    • https://srilangkapools.com/contents//files/xokaviwomab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=christian+dream+interpretation+book+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_off0000de31.bin
6c35af033f75924e041c1b6d3951bcfc5754bcb7deac86a4e720a135d61324e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 10980 bytes
font_01_sfnt_off0000f744.bin
7371d90af9211d7640fda3ac0f462eb08dde1cbcccbb4effa8bc12bffea231e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 17640 bytes
font_02_sfnt_off000125a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 16792 bytes