Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df31022fa58974d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-08 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edd7fab54d5e7fe41517b2b2478ce1db SHA-1: c71319e0fba8946f4f2525a2417ce8b67c6b7a9e SHA-256: 9df31022fa58974dd571930d658de0239dd90bc9cc02ed3c977d4631280cde38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb3e37c384---kivonelakeximud.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b1bbb9792---52731102471.pdf
    • http://casier-a-bouteilles.fr/file/67629210434.pdf
    • http://georgefamilyreunion.org/clients/86186/File/47437606941.pdf
    • http://ash-graphy.com/userfiles/file/13816421145.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8babb4219---51116534948.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a678fe9a9bc---4803177534.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718f9dbc144---4333637405.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b515b1dd---buvamomifomiravawag.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2ad913b1f1a2aaee2764b33c97b78c4a/10036634250.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e94cc8912865c7a2a9336ba2873fa20c/85792595935.pdf
    • http://promocode.lu/userfiles/files/11347566860.pdf
    • http://struttur-arch.it/userfiles/files/zebosigir.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/eg062v7u4n88tvi10f2nefkg00/dimudodigokek.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/23255447151.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f683a9942b---67571728491.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/lerigipigedaxefozavup.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/42c925e06210f327a8a11b2ba97b146e/loputekalefat.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4154037e---jalimefavoxubosuwi.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/94cuhc1oqk8ehh5j17ftgbp8lo/wisog.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f69c1f04---83363158631.pdf
    • http://zonazero.es/userfiles/file/pofituro.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/bk08gkqqnmgl25tick6mk9siho/52428153455.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jackass+theme+song
    • 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_off0000f132.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 16792 bytes
font_01_sfnt_off00010944.bin
f9e398320d51bf8c8a61dd15d0b9d9e1e2c6f380fc62de7e32495270826f209d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 17108 bytes
font_02_sfnt_off000135d9.bin
5859f7c01778e8360fde0356e5eb58fa76dbd9ec190cf512374aecd87dda9a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 10524 bytes