Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2a54a24fae314e…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 02:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c92091b9147b0e8dd8b154ade7f746ef SHA-1: d53a24f2e2e0ad96dc9baa1789eff250dd7d5241 SHA-256: ca2a54a24fae314e3c0fc9dde1a0b4d737e1b43043510c743cc1ab8cfa3e63a0
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 URLs forming a link farm, with several pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=number+worksheets+pre+k PDF link annotation
    • http://to-tuong.com/media/ckfinder/files/puzogidimefe.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/kejusenefafepexazoxe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f311ceddd---legalujitowomaru.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/22537941554.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2c210e8e---tikaragokiwu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608845147af9f---bapawewufusagol.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/07jkji9846uj11gpvhcou5c0ea/58506910107.pdfIn PDF document text
    • https://lojaortigas.com/ckfinder/files/76883240191.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/nuvotuxozirejunuke.pdfIn PDF document text
    • http://surausa.com/uploads/files/gizikekaf.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/duzimitavukixopa.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/64883355423.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bcaacf4---sazazasalen.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/besagapu.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/17387473439.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210802_46278EC5CBE4CF25.pdfIn PDF document text
    • http://ccmyungsung.net/userData/board/file/77757589157.pdfIn PDF document text
    • http://surtek.biz/image/files/20150129_050733.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/45698877899.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/3003484468.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gr0jvmfhoo5m907fhaf0anc9g0/bovadopowize.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32c99e4df---kibog.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1627601894.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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 10508 bytes
SHA-256: 58a28ae4f81f76ef9fca7fa5749cec505f5ca1a0b948ee6e4c614b9975610c8b
font_01_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 17252 bytes
SHA-256: 6cdc399dac0d6af07b193d2914d1942cd805ca1e28be0ee72e3c9d5e12266a4e
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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