Malicious PDF — malware analysis report

Static analysis result for SHA-256 857cc6c8f0b94ea0…

MALICIOUS

PDF

85.3 KB Created: 2021-06-27 10:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df7337d09e431b7a549b8939e74f1771 SHA-1: 7c60624d0f92149319f770fb01679b6e1100e8e5 SHA-256: 857cc6c8f0b94ea069fb6bd8a88814dd82f8eff514ac471d4a8314b1a02f1fc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or facilitate phishing. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=who+was+andrew+foster
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087052b15d14---gokaxoxisuz.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a52669d5afe---rikifenolibevanimixo.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb32878986---57359170857.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2412934a6a---xinuvitara.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e618ec5663c415761903332be6d7e075/zimowitotijuxor.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/d64f8127c3b9082b4157eba79360e2e8/91043715051.pdf
    • http://kwong-cheong.com/userfiles/45547085097.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b3eb1f0f---92953485979.pdf
    • http://www.deco-interieure.com/userfiles/file/88559535810.pdf
    • http://firewheels.pe/userfiles/file/3799803307.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b8262d970---82614088253.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/49972999207.pdf
    • http://vdadanang.vn/app/webroot/assets/files/mobip.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/59d7b84ae38bf8f65c5e4a3d566cd9ac/litibu.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/da4ffd3f5f7a42a65db2247bd39a00db/86030410971.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d7ae1b2d---vekiwakusuzosipaparilu.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56809e887---dawubebidowuvexulisubomep.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98dd25ec83---fajuj.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4bff268a86da5b2c045547e2333687e8/12855112535.pdf
    • http://bluekeydigital.com/images/pic/file/miluzezuvubajo.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e036421e33---83554561209.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gtq6l3gpe00oui1gue5ghe128o/zaxuzulosuzasis.pdf
    • http://yuhongzg.com/d/files/35297016419.pdf
    • https://bamfieldrental.com/userfiles/file/riwevevejegeke.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7a73df11f4667dcb30de6e3a2310ed65/91768288999.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_off0000eba4.bin
b3ba809750bf024d1806e3bbdd6ca8c53357a5a8022673b7ad1d253d7b671f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 10392 bytes
font_01_sfnt_off00010330.bin
351075fb21f66bd4446b2cc11f3a096720dbcf57b7e56d3be52c2f4f71423197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 17108 bytes
font_02_sfnt_off00012f96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 16792 bytes

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