Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5310e32619e44a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 20:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2703a9534143d2da07e958307c52a6ca SHA-1: e6cc0ebb15af4baac2cbdfa02c4562c81dc62ce3 SHA-256: 0c5310e32619e44a60a9ee584172022f887f717fc409574db0beea42a5bf770a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs hosted on compromised WordPress sites, indicating an attempt to lure users to malicious content. The presence of embedded JavaScript, flagged by heuristics, suggests potential for further malicious actions such as downloading additional payloads or executing exploits. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b675aaafa66bc3612afd5aba0dff1e6c/napakepisadefitomodikadi.pdf In PDF document text
    • https://coastalstudio.com/images/main/file/98460690364.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3beded070c---wurudajewilapotikenurojeg.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/fapeja.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/887cc77406d1283e979569fa5ca7bc62/66522524291.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/mobovufuginuj.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a52710ee9d---55810029518.pdfIn PDF document text
    • http://digifast.cz/userfiles/14019269726.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/38953876349.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086828983489---6318127817.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/os77uirq39ruq3i7mgk0ftuahd/jedegimikemawu.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/repubivabofipe.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/77331131269.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/renamudosux.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/sepopi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6hg9nbpvuq87ucni3et1jcn6b7/xadoro.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b15ed125bb3---29074380156.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75e9a8556---92810278360.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/52030281069.pdfIn PDF document text
    • http://polkovnik.su/upload/file/sotak.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/vuxazemeraxuwisopulal.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607479160a8f7---bogawomafadikam.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e70efcb70f---nazob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e0f11ad9c---79705602979.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/jozorejixiguzeres.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/wepodaxibolarosafemapiko.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/bisiruka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=convert+pdf+ke+excel+gratis+onlinePDF 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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 17252 bytes
SHA-256: 33445e6cbcec26ea3553a9a5b0d4f7338125c328ff11de10356bdb7f7f9374a5
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 11088 bytes
SHA-256: c8127936cca149767a8821d24274f9be04d966de1fe715ad10e6958a584a68e1

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