Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87dfc0d407346fe…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 12:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f35d94c96ab8a69d13328034a5059a3b SHA-1: 61d69279b4382a408d202e01995ff9f9128e7194 SHA-256: c87dfc0d407346feeef7017fe555ef396ab836834a443e587fd6a5fb628d8845
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it is used to distribute or host malicious content. The presence of numerous unknown URLs further supports its role as a lure for potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080158cd2e25---94102581328.pdf
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/1b77b1c1870d1abc2d15a2ea2087bb5a/42230780166.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/df736a86adb441f2a7b05d5067fb0e75/90549167734.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/10c57dac7c3d48046e37fca2ebe68a27/24677556942.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c13a7ad0f8819b90d04e6cc9ab578652/83463183821.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6ef82f81fc03f29f16d485d641c04b56/22253213130.pdf
    • http://extracam.es/app/webroot/arxius/file/72021187602.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/302ceed70524544d91e12724217c3eb4/70042197428.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af8f28a03---vikumi.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/59647414099.pdf
    • http://goodtraefarm.com/ckupload/files/72454765262.pdf
    • http://caratow.eu/userfiles/file/wobovaxobiwijebi.pdf
    • http://donateagift.eu/userfiles/file/kowawop.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3df6nnqj1t2nbfe87ka5actml2/nibibis.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a5a98f7e---jegawezimerujudusavuzebip.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76569190d3---11621261708.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f225e10291---66891638816.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/41232476805.pdf
    • http://bistakalikotenetwork.com/userfiles/file/fijoripetabesojixogapezig.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609722c4a3d99---87592895620.pdf
    • http://lamachine.nl/userfiles/file/8710463834.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9f5774bf504a68d7e508bec789350275/dosorasabotuzule.pdf
    • http://ledson.ru/upload_picture/febiwebiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=animated+tabletop+christmas+tree+with+train
    • 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_off0000eed8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 16792 bytes
font_01_sfnt_off000106ea.bin
c320e34318b0749154b7e1fd49c1d3682247d23d176145cf9bff7436cb255daa
pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 17192 bytes
font_02_sfnt_off00013390.bin
ec3a8c1cae722c1477a388c8442ad5986726cbc97a49825aa58ee88d6c086d0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13390 10984 bytes