Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8d2d1906e46121…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 02:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f9b5e4943bd242f9d7cd99c1394c06b SHA-1: 7264de385c91075029ad13d8315fe747909dba70 SHA-256: 8e8d2d1906e461213487fd6530c5030383f44090f7cecb4c78d0d2e28f860618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics further supports the attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=how+to+install+android+multi+tool+in+pc PDF link annotation
    • http://www.toptehnik.si/images/mubusopirexixepotu.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/tirupunejitizu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d2a1e6e9---fipulogikimakajamulepum.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa81bf4d1---90769951039.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/nalijomepoto.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/62066204392.pdfIn PDF document text
    • http://odumakus.com/uploads/files/89595582387.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/kopekuguloranadew.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/54581425800.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210906_53C8D45936A9431A.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f624c496373d5407e518203a9cc78395/mamuxekuwudisi.pdfIn PDF document text
    • https://deepex.hu/hirek/files/vusujirivevawebimifevuva.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/zixugesovubipuwi.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/zoneronaguv.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/logovulip.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/63596007881.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/72187846797.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/82b19c0a3dd8a187d304d5b291e34955/54914051192.pdfIn PDF document text
    • http://fohow77.ru/upload/file/bodufaz.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/vonata.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/5932711256.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/zixivemavuvulivitanetozux.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gue3rfe91gnrr6le0r20r1rfre/81917438414.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/81464291036.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/repuw.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/zozuzosazijabimaz.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109062127526780.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_off0000bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 17424 bytes
SHA-256: ba34f99bc92551a621af67f723b5200a222004e467b5038ae56b966651ffacf9
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 10720 bytes
SHA-256: e228698b0f6547aa1e2e0eb2f319f758c313fa66625aed909db8bb5103af1911

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