Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb8318f192008b5…

MALICIOUS

PDF

82.4 KB Created: 2021-08-17 11:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e7f511f18977d35178ac04c5645c5c66 SHA-1: c5126a6faafa72e7edb150c870a3e45bcd80992f SHA-256: 7eb8318f192008b5530d37ee6880fc5afba8cc87c4273e7bf9844da35a6ca04f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=modelo+libro+diario+contabilidad+excel PDF link annotation
    • http://chukysovin.com/img-svc/files/81762547869.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8f189b6f1---78168720608.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d241f6b243---puzuwotanu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6a135021---wuxerokanisu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160747df4f00ae---93905489855.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c3379fce4903cfe48fa701c37e42b48c/66820812387.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/6527500713.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31c59cc75---11409707920.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c406731dcb4---libosabid.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/sepis.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e31e481f7b0---3433154033.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/46695265884.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/mapedajetiz.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fivonuvasadaxigodosesa.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/9114107469.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16072628631bae---13127100460.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/karalusanisoruxot.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/39531753886.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/23835463310.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/ritotuje.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/pudanatinub.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/pituzunumonowazizulana.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nb5frpqqhr0k89f9ejrs1e23md/busavuwekirakinopet.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 17944 bytes
SHA-256: 3b49e31660df8b6c96052d7d88d6f3eaa89d2ccd7a5742b1a7eb499743494359
font_01_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 10428 bytes
SHA-256: 377b60ed8fa15c774f8d299c6716a3fd59f74ab68c4540f86d808e0597970d75

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