Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ef02a633fb3337…

MALICIOUS

PDF

94.5 KB Created: 2021-07-02 01:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48ad4c766eb54780133fdd04038a1bed SHA-1: 3890da821f4fb93cf7bc98f3d5038f709e7ab52b SHA-256: 58ef02a633fb3337dcf18be25f46f2be5823b5b765fd877a8410f17e244365c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple compromised CMS upload links suggests an attempt to distribute or mask malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/63f1290873765e626fed5f21f3e9700d/fasunaserikadi.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb19c458b---pofasererema.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/krtldujgrc0avns4tf289ofc54/6827507637.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c85759722c7---susudejazawitaduloxubok.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/de07ed01cf4b03fd31a6fcf14dde5e21/legis.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/61740309357.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/gipasugazise.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/fudukesafemogolu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607038e2cc13b---getabimakadapobulab.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/768c23bc4a529927cde77a5489196c16/36008653289.pdfIn PDF document text
    • https://airbays.com/userfiles/file/puminakurutone.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/74412075703.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/90976f298d4a469c452f6b780e3b055a/movotob.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1995fe0cbe19c7525170ab04a017404e/86760504847.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd939c81a8d---66728299207.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/retisiw.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b84a3bd9d---runesa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df86bd3edc---webof.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/poxovitu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/24174918215.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/wusinagolima.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5d977f2bcb992358a7c2a27fb8651e6d/dateje.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/56887629225.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0bef2f790---kefukanitasonivir.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72f95008b---51364815295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=aged+care+interview+questions+answersPDF 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_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 18532 bytes
SHA-256: ba0e7d38f5c0ca8b633112093ba2db7318218fece8286e344b8b4e53b5afb0ad
font_01_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 10880 bytes
SHA-256: cb24994d3be3e32d2ed9430a70d7a880c403f3448315a0d5dd1941565e172ebc
font_02_sfnt_off0001542c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1