Malicious PDF — malware analysis report

Static analysis result for SHA-256 862cb3481d7cb2a8…

MALICIOUS

PDF

84.6 KB Created: 2021-08-10 20:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b54facaf3646526bd994d2cc2f5ad2b SHA-1: ebc354b4c5b8ad25f97bea710ff527708d2db62c SHA-256: 862cb3481d7cb2a876a9d6b2cd93e39f89aa4e343eaaa5399188a07b52cdb7fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting, likely to distribute further malicious content. The presence of numerous external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cructi.ru/uplcv?utm_term=hl+ahuja+macroeconomics+book+pdf+free+download PDF link annotation
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/835c59e8e2cbae64f4b2d98b72b8649a/gatas.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/02t72et05n6urqe5lvhnb93df7/xopil.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844eb120806---7325632084.pdfIn PDF document text
    • https://totounited.com/contents//files/23559639866.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/riwasoxonoverotosufebifus.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/wukenibuduwete.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/kenosene.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/phku0kg88sf9r7iriak0asvt41/95253870151.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/25521123109.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/26388023053.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908416eea13---61191956309.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/gowidezumifited.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/89691668671.pdfIn PDF document text
    • https://arerp.kr/data/file///10799896019.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/41896072792.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/79315249320.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/toviwojaxupodusalisobapel.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9mhnm753ohbua7q5tqjkiq3rgu/dijagodu.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/41361922732.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/wofuduxopo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/h72d6spndd84h7iibk4kn2puic/zojumanoxebupobevalejelez.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/quvgjhbf1m5gtugpma6vqppknn/jubopabuwiwekujirit.pdfIn PDF document text
    • http://climtech.com/files/files/91619418054.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc70479b4---debukipimenasipirobokegil.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/791b31dc9f0fff40b602f2750f1e7342/30724007546.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/nixojedeguxanabulu.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_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 11328 bytes
SHA-256: 18382cc980209b0eaeca3ee166a59bfd906a0f13698e3198dabc50ab60ed3d3d
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 17724 bytes
SHA-256: 1446b6d9c43e6a18d63e2a6daa856a7f0195ae7388f77db7750176a1205a0d48

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