Malicious PDF — malware analysis report

Static analysis result for SHA-256 43acb37fc9da22e0…

MALICIOUS

PDF

87.6 KB Created: 2021-09-09 06:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec42d1737c3bc0212ccbe6db22284cff SHA-1: 471f17418d8f2b4a087350749b5865a8e7188d92 SHA-256: 43acb37fc9da22e0f09bc007fdcdf0ef331c3211bd3e15b20b806f74919f4fa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for initiating malicious actions. It also features a link farm pointing to multiple PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/75aea3ca04ca64512ddc4daba79a0a2d/fuxonipifogapirozagizukad.pdf In PDF document text
    • https://learningsolution.ca/userfiles/files/linirozeruwi.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/pazisilef.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/69848373427.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/nogojotetudoxaw.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/57426548546.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/621002d57c16e24f03234f089b554e9a/39918830139.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/faretape.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312aa97c8b6---zepuruzebenabitugibada.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368c305af6f---9568782923.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/lumofizomar.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/17521012946.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361ba8355c1---nenimanafaxapepab.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/33655094687.pdfIn PDF document text
    • http://platcometals.com/images/file/pekelifofasanoreki.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/jebug.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e5361ea59---60615329675.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4p3ae7ip2m3ac8tpa5a5h3kpq5/kofaduvuvetir.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/vitiboxobajubu.pdfIn PDF document text
    • http://th-hl.com///upload/files/34098916755.pdfIn PDF document text
    • http://haphadoor.com/upload/files/movisukebemewa.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/toribamumek.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/nawubukedafavunum.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/37564468110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apk+movies+2021PDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/83733357697.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_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 19096 bytes
SHA-256: 35629eb384e6e3dd87ed09e1756ecd118aad26772401d910a7edfa98060dfa47
font_01_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001394a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394A 10336 bytes
SHA-256: 3758bb0e6dcfa084da519a432d54faeb315761c3187f0ae37afd79b6844f3ee4

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