Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97415f98f45b1b0…

MALICIOUS

PDF

104.6 KB Created: 2021-06-28 13:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74ab67fd23e5d5c7bb47ed016aabcb2a SHA-1: 94c3e53f24120607ed895fd8e4c4859d28faceee SHA-256: d97415f98f45b1b0cba9763368362725105549ccdb584ce298940d92f4a44a62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bcab70553---zirinomukamuliwujosuk.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2aed30eff8611550d2e3bdd2449aea63/81978859082.pdf
    • https://arab-hams.com/Ups/files/7667053489.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712c98f3612---panawodob.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/54938053507.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1cf49c379e979d8bd6b24bde0d6136e9/febuxafaveran.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/75054bb57e04e2bf8b8ac4b84bfd253a/23913319639.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b082b472d4d---43865310820.pdf
    • https://iva-vietnam.com/userfiles/file/31388024865.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23ff17679f---76959394918.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4516ec4452bcf175ce2862e248921c67/50961735982.pdf
    • http://palyavalaszto.hu/teszt/upload/file/fuxaxijefinapuxaxol.pdf
    • http://allasclub.com/campannas/file/tigipikulisupefukuwoxumur.pdf
    • http://danfilenemd.com/clients/67744/File/4670232417.pdf
    • http://fouladsazanco.com/Upload/file/66799240542.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/69089042947.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/xalajajawobogovemig.pdf
    • http://allmedicus.com/userfiles/file/43748041893.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c048f0b2660---27459714216.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5p1ek84h5tctmbsr2p0ioo5p74/rupudunaxikukevimu.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089595c51189---talugitiboxetukavuneges.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609025a5992bd---wizufebusuvikijotid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=medically+compromised+meaning
    • 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_off00013566.bin
f95114f40c7db33b62f289226afbebbe9176c486983bcc82120836b93084b24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 17184 bytes
font_01_sfnt_off0001629d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1629D 16792 bytes
font_02_sfnt_off00017ab4.bin
f8274052941ef999d3efefd685607f2b8fd2dda8b5c492ab9238e7d7c5ee337f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB4 10864 bytes