Malicious PDF — malware analysis report

Static analysis result for SHA-256 639a2ad637ce6ad5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 17:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7cd108d0a45ae5ed61e5b2e066297b69 SHA-1: b7986892179b97f02db539d0767c461c641497ed SHA-256: 639a2ad637ce6ad52ee9cb32efd214b333df0264e84d50970bea3c5181c82f25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also hosts numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded JS and external links indicates an attempt to lure users into downloading further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7d20acb4---xotogawane.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/812904b764ce2ea0681444c54f53130e/pinotilawetupaguxolunadek.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/16101771246.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5a8ccd7a78242c3679184b8da24e736/boteg.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/gijibumigexovonaro.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/65138418420.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/806af47ef9f5b156859388e9a73fb2c3/7021550002.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/94381911876.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/fejolorijida.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc88974778d---97068563431.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8b658a8cde6a3c6efbe5b53626cd76f/pajuxogidewuzuvab.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0490dc543---21187302552.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/98277734415fad30f8f1ab6015534636/96035310138.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/befebixav.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/pofojuwojedujita.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/59027482593.pdfIn PDF document text
    • http://net-marketing.hu/images/files/kunusevetepuginasud.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0hdnm1to6sfo4a3616ipdfg341/86335592880.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/94723869760.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d75185b8---gitadolagu.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/44005735759.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/lexekonoduwavinugaxorize.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/29659379701.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096589424737---10795995351.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/numikogomewusobeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=scale+factor+and+dimensional+changes+worksheet+answer+keyPDF link annotation
    • 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_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 11288 bytes
SHA-256: 500eadc278e2afa6be0606af832500206776e5489d437753a38196244cdc0803
font_01_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 18236 bytes
SHA-256: 37a5e3ac0b7f9611377ebd26a6061a8386cc470b3b6478158aec147f838c7672
font_02_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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