Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c28c4115c4e0f32…

MALICIOUS

PDF

77.1 KB Created: 2021-07-04 01:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a3a1902b095d7a606b10aad5a0cb36c SHA-1: 2994774cface6215b8f975a6ff7e58ac16a54102 SHA-256: 1c28c4115c4e0f3289be97395a5f62dc9beb20a7e294f8f4078f773104786340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further malicious content or submit credentials. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/70be34824befecda77d9c7fb20b3bbd1/44725311856.pdf
    • http://vds-construct.pl/userfiles/file/26133414127.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/554bfefffd47d4be3a531991131426a8/87701684362.pdf
    • http://assushop.com/userfiles/assushop.com/file/21393102555.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7112c470a0---lopebagawuzafo.pdf
    • http://pulsarvn.com/media/ftp/file/nakizanigudupovu.pdf
    • https://communeouchamps.fr/userfiles/file/kibunafunefelotidudegew.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a203570e63b---nutobaxujojut.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fofetebalopibuk.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1t014gsvl5v0d8gcuq00m72v3k/20289791427.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c24e159c5---kigagasalalex.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d30aef20---lobisovulitus.pdf
    • http://kaowei.tw/image/files/20210526_200010.pdf
    • http://otohondamientay.com/upload/files/sunidagod.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e0b5d8f9e08076411e65e73712612d9d/pipinugegigu.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2065fbd893---5812296730.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d39715dff---42487208140.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094809060e71---wirofafojipoduz.pdf
    • http://imssp.by/data/images/fxeditor/file/fumekijigorafonuvalimo.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/de62f637a6f67bbbd62e407bb240bb18/fupakiwafop.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c95b24793---bafibuzexeborarogukitu.pdf
    • http://studioarchperissinotto.eu/userfiles/files/bedalasuxisawot.pdf
    • https://minipowerpack.net/upload/files/nilumuzuzez.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5112f2592---depozesaxetilejap.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/19315079d6aee3f4b9fba53dca1d4c86/koxotatotuxidobekusijuvax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=huron+pines+americorps
    • 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_off0000cb34.bin
169491096bbf2d4c5d8b90d2c3bfd6f6dba24d4b7d72a5d2699a2b3888f25814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 10484 bytes
font_01_sfnt_off0000e2f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 16792 bytes
font_02_sfnt_off0000fb05.bin
3f2657aee5d8b32b4ad67d773407c29a9df0394234c344473c11ed7301ff9b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 16428 bytes

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