Malicious PDF — malware analysis report

Static analysis result for SHA-256 880b19d018d23102…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 05:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81a501a55ea5ad79b235e2e398ea4504 SHA-1: 1c9896747ee2e9b886baef5bfb14257d41fe60cb SHA-256: 880b19d018d231024652dab82b1fb3570bd36230e227fa42165bb683d396b57c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bowlingkillers.com/imgdb/files/welapar.pdf In PDF document text
    • http://sayarbobinaj.com/file/338709385.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109130557054304.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd169f470---babesesap.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72228732888.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe94bd85c3---16934499983.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/71193036174.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/sinufuxaso.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/rinoxudefefu.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/47243115845.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/356742d374165e444a22ebbb3b581d76/90687029482.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/42916764028.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/jodumunitexozinopuzubuxow.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/29696163589.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141938b3bcd8---pavuzapo.pdfIn PDF document text
    • http://csp.hu/editor_up/mesilojunusetizunelo.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/59273295387.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/77297455081.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/8608249683.pdfIn PDF document text
    • http://jarosi.hu/files/file/pokotidamamupimunimuxu.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/44077444740.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/nawigukoxep.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lufedigovufakalejutolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=emulator+download+for+free+firePDF link annotation
    • 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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 10516 bytes
SHA-256: d325493faa350c02fa35b14203b6dd05d7364b33fcc49ecc45c7ceef972283da
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 17324 bytes
SHA-256: 3a17a77247331b420c73960bd9b6ce1511efb3ea1a2aab1fd2da506577ae0b39