Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c425a721b65c725…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 09:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7381fa8076a6f1dff7516db5b1553252 SHA-1: 30e895fc6e8389f8ea587f41779f19a477e8f198 SHA-256: 3c425a721b65c725b1db17663063fa5ac4efc1291ef31553a90f5119535729a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. This suggests an attempt to manipulate search engine results or host phishing content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://intertexmedical.com/userfiles/files/sulunaxadenivifilejefeg.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/7ab59c87006466d100830ab8d9ec1b18/56438754729.pdf
    • http://adaviestransportltd.com/userfiles/file/kuduvuki.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b761a3f0afe---62411221758.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2dcd0d624f8d1fd622f90ab1236a4e51/26029965080.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e9ce7357a374f4a410f90efc4bde47ff/badimaxoda.pdf
    • https://carrieres-pierre.com/userfiles/file/xevipolizapuxiwerixipi.pdf
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/93196735602.pdf
    • http://atonoserver.com/userfiles/file/42462443707.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acb5701f2---sugetaxigigifidoziditor.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/baddac7650ec0b7e9d8d5d1ba6dc65fa/dalibomusekeziv.pdf
    • http://autosoftware.company/autoresponders_images/files/lotupagamanezi.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089c5336b5fb---nusalorofizedogaleje.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4d81aa058---76251891426.pdf
    • http://schokoladenfontaene.de/idata/bizidutipesatawanajukivaz.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c88814a6a---162752964.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746753c2f85---883072707.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cdce70870---sixexatizipazoduvunelid.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080519cc0edf---81750364477.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/mepurapejerole.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b747b90b199---19217985094.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a010b3632cc---93114774564.pdf
    • http://goteneplast.se/files/images/file/42858089842.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3939a683---46692834823.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2cf59bee67fd7fc506cdfeb724ceba6c/25672003012.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+fill+minecraft
    • 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_off0000f056.bin
ec58193c31995a01ed0399c29c5e624c6b3a4afbe0e5c4a437648e5e06656b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 10404 bytes
font_01_sfnt_off000107d5.bin
4e481add8b136a9af0539ced66bb4bcea7329e900b59faf79719b2a46816ad36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 18196 bytes
font_02_sfnt_off00013676.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13676 16792 bytes

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