Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28186cc63372a90…

MALICIOUS

PDF

88.5 KB Created: 2021-07-06 01:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 332183fb416faa1efc23c7693c823419 SHA-1: b8216b1ad783c55c7fba23acb213fe724747a83d SHA-256: e28186cc63372a903c6835c7590c1277f38b376d23149108429e2b580d8ab483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6b91fbac08ccca7cebb172bf6215000e/79034323803.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/fc82717876bb600cfba61a256cba8f1e/18189398902.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0574ef7883d1f8217f4755d1eba85049/84755895055.pdf
    • http://skogsformedling.se/bilder_umeny/File/tefegakegaw.pdf
    • http://aylincinarli.com/fckfiles/file/tetawakewimowo.pdf
    • https://wecareu.net/ckfinder/userfiles/files/mudoxadozuboxilobeba.pdf
    • https://betenrealestate.com/sites/default/files/file/49315496096.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/mobikesusaligoximuxasi.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/tinerukifu.pdf
    • http://eortak.com/img/fck_temp/file/zitabu.pdf
    • http://cyuanmei.com/userfiles/file/fepowapopuned.pdf
    • http://100gastro.cz/soubory/files/74289423702.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/qgq2vknvq190fti0f39c917fu6/8581115059.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c7b5573ae---kevirebimalukal.pdf
    • https://activepymes.com/pub/file/rixune.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc16ed477---gajanogu.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8c732b7a---94406560778.pdf
    • http://the-bom.kr/upfile/files/beteterozav.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/093362106eaae827329e06c0b9fceb20/lelupuwig.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f2cf4bb0945df538a9cadc4f91ca4954/fofamonovifilezumozapagar.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/0b33bc70c279c45e8111012e834223dc/9130207172.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a307d88f076---82119953730.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa5b88461---4378593190.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j288r2dh3ug9qe2ft3o6u3d3f2/92902456761.pdf
    • http://fonnepal.org/userfiles/file/xurowugami.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cbse+class+10+english+chapter+2+question+answer
    • 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_off0000f52d.bin
e41463bdb06b8dc77cf3197912628bd0ddb73199b9da3c8ec89d65a537db00ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 17232 bytes
font_01_sfnt_off000121c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 16792 bytes
font_02_sfnt_off000139da.bin
7958eab09f9dab91fbf98a497b2ddbb988fccaef65be03a30ad4077c893804ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 11448 bytes