Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2237b1646d178e…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 01:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0aab05b0356809e1a019b4beaa7d112e SHA-1: 251f2df1466a53b803b791b9d5266a73fdd3b3c8 SHA-256: 5c2237b1646d178ec8b87f7c5c075f3e07edb27501a4ec2fad5ebe3a3ed195d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters further support the conclusion that this PDF is part of a phishing or malware distribution campaign.

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://coretry.ru/uplcv?utm_term=cannes+2019+indian+celebrities PDF link annotation
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a09c4ff8---53828421920.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gqheuedelm49pne7o5cl0m0fv3/wujurew.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e094ce5c376---fupufavufuwasixuwe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/38gt470681l3lvktvdi9f8pu4e/mupidopopete.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/21053454657.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/lozowumatijebupawu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/417c484b31839eb8c240a5096156876f/xujolikenotozesininaba.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/c2mcv1fu5f8ih4lbvl4dhvs1cf/rumapozafole.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3f048e633fdeba81adde307ad4b6afee/79821190389.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/xazitigi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/247727607.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/difamukorezuwapeg.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e1f72289---gitobejunawavas.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/fowapufitonenedu.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/rixemugibenikedazimov.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a23e78b4---83866060370.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5a1fmt4ib860hb71hqclvr6h20/bugixasojejeve.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kefigi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/16042095131.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/79406019927.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606e59fdd8c63---10079232546.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a38f587f2---bokerorimeboxafibadalatu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070418055204---derabij.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0979b70d---vorenodalizi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608223ae579f8---41132319020.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/lozexanufurana.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_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 17632 bytes
SHA-256: 90da264fafe9f857233c5d0b4a97610d2ab3d76f1d27694446385552da3dc3e1
font_01_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14366 10876 bytes
SHA-256: 64e0c4dd5fba7f675c87e36328b35e11efc9a903f9a86bd9e3fad41e322949a2

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