Malicious PDF — malware analysis report

Static analysis result for SHA-256 833cb8e1bc0f3d3f…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 23:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4eaa66082e352d91ba1e410651dd7dce SHA-1: 705fb48503752db8681bbc34cedafdbd74b484d9 SHA-256: 833cb8e1bc0f3d3f42b1da494db59563c8ccf3abb44ca20f7dfadc49619f7cfb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://irlanc.ru/uplcv?utm_term=lynette+fromme+once+upon+a+time+in+hollywood PDF link annotation
    • http://yfatc.com/userfiles/file/45888188945.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/5076d3d424616164b0834894378235e8/66011893182.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/belazuwuvatu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23f482d41---ragutoweso.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dc57ffb52953f22dd21224e47587d722/kijenilasezewosejalew.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/37uf1sorbmq1m48kvb08jd8v01/1581361026.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2682c6d4a---tejupujujuda.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a782c22a6a6b0ea9e499a12d947fd3d3/2351998014.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac901003fa4---pimokogozunedo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c79b12e0fa1544c2338cbba1e970194a/faxiwapizivewasiwumuvud.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/84837828689.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/vukomejitigofa.pdfIn PDF document text
    • http://azizolace.cz/images/file/53825497273.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/69249da5d169a66ab45df1b093497747/85778656729.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/apvmr1ogd87ajee3115c0hnunk/fufanomegux.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a45a44493---48789958190.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052422592373499.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jubiwonujelemaroxorav.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501220551466841361.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2b45fe5f64dbaf20170182896a373115/todalozorufisuledugesu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vrhjh5ec245ohjv82sq1tkau85/pemokidim.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c300a363a---21247627322.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5df5ae991d53da2739f602406cf2074d/41120806706.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c60fb8cfd2be28b31d9b3456cee55c5c/ribop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 29204 bytes
SHA-256: a572baa1c65daf8e534879e275e3b0da70fe9a5cdcc27f39ac96da5c7bda7b5b
font_02_sfnt_off00014d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D39 10976 bytes
SHA-256: 591c2a20808f72ce89941f0d31c09ab0c936dc44437396fe98a28ca9a9b588ce

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