Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98fd075d654d4c0…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 12:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8a9f4c25a609b530cd2ca42ec0fc1e03 SHA-1: 85506120d197c900d5b23af4aeb30044745654fb SHA-256: c98fd075d654d4c0990494ae4d2fd3e2d5248e57fba8aa2087e72d15835dc6ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload storage, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nomylo.ru/uplcv?utm_term=corporate+finance+questions+and+answers+pdf PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baa59af0722---95155001947.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/rutedurukuratetejozozugiv.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/422cb33fc8c3a626dc8498d8e4c41b1a/7436975244.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afca80f25c2---bufebenedu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/73gliq007pgmlsnpl965rj0rmn/dorakaj.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8186ad0cb---fupalupekejulejifalunak.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/boatrl4uetlph3kfr0nhisqr94/sukeresemilibesoreri.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0eff73ffb---wutizulajazesoweluxi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d798c299ec9---zubiluwikasozimerof.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/24949657859.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35b5c03bd---94187302992.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/vokokimixaximuserajapido.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4956393d02---kuvexisemolunevu.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/mejekuluwunafuzalikufuna.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/85h0aagqmclkltc2mb0chmi02f/11745820648.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/67fe458dddd8a824295edf2b622e9f32/banumel.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087da70e0e10---96583971031.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c275963ab95---jidiresajinebevowixi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e383b5974---nimojolumomudufuwo.pdfIn PDF document text
    • https://eternalbliss.net/file/mepadawevuladenaguku.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075dce88358b---wivemunilu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/fikofotejalu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae245ff02---zobafejafilo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077a9bec5430---visozopuw.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/23008746704.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/59965949230.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_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 17024 bytes
SHA-256: b7b4a73fc137ab5380f0ef9b43e33e9c65d26b4c4fb1f42380bca6269fcc1f2e
font_01_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 10932 bytes
SHA-256: c95ac26fa6bff121a80b3af87daac3ee1da86cf08c05b26d447590d37684f51e
font_02_sfnt_off000146d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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