Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1f7a04a1fad850…

MALICIOUS

PDF

77.2 KB Created: 2021-08-29 17:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38a687ccc1530254e0931720cfb6609b SHA-1: 205e409e4ad45e1f7c7f8e7c1ca7ca5bdc2f4b7f SHA-256: 8a1f7a04a1fad8505aa6e0649fd540874468307361d55b8c9ff0c9873514cd17
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting an intent to redirect users to phishing or malware-hosting sites. The presence of external URIs and compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=examples+of+series+and+parallel+circuits PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1c1b0b08---vavasid.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/71144976056.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/gitefitusutole.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/59254905917.pdfIn PDF document text
    • https://plasy.com/uploads/file/garugo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6c6cbfb68c41091823f64af4567ac896/nafarerugokegozesozobete.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5237c416b---15908475827.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/vogesawakexididubedo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f0cb7e1033201c91eade09d7308c43d8/26139532611.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8c275b5004f7ac23f864f2dd73546507/61779913160.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/9688480877.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c92130c2951---piliteketotawaz.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/71264750103.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/xidubitunonel.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/oe1j2phprdcf60291nr0666ktp/nawogelijo.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/97787661904.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/fuvuwunolumivuxerez.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/pabazanojelel.pdfIn PDF document text
    • http://ruihuitax.com/files/file/96065809293.pdfIn PDF document text
    • https://kueapem.com/contents//files/57289957289.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/59802d15669a5868b75a65204d740936/93363865164.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2063ae4bd3744c6efde499a0c0207c8/kuwigu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f8708a0c9---78846787914.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_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 16400 bytes
SHA-256: 99baacd2a7372b85eb157bda0ede08639a8a824ee806c34f03af6f4b54908a18
font_02_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 10964 bytes
SHA-256: f533589cab4c3134930b6c87ab1de17e6df52f11d3e9b5c83b20972bb1d019fc

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