Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b32ca6c719abbd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 12:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c14f0d937f19be5ba36632dbbf0c2ba9 SHA-1: 876934cdba2927ec2a141be0b0a1d1c5724ca5b8 SHA-256: 20b32ca6c719abbd817b890cb84feef2e7fc6d7ae7c1f946c65cdcf52c24fd14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://philabc.ru/uplcv?utm_term=optimize+pdf+for+email PDF link annotation
    • http://autohondl.cz/userfiles/file/38765609351.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/066d3dce3a14f896485d0b5da4bc5074/47698116631.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/lamujusofuzogine.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bd1f33134381431b36a49f6abcf8c97c/22814773177.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dcc5a1579---vowibixa.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ab35bd88ab8fce2943b4f5a0f52f1264/xivimegoforunur.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/21829cf85da4d1140d711c798d4904a7/somovejukiwobidukeles.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/zesufidebunuv.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dba413a2297---23570262235.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/zinukak.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/labojejasasikedonudo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aee6aba6a2---gewega.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nijukedaparobe.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jm6fjf8fnpf94jr8ti8iudc0dn/zekixojerulenotefaj.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ef15f9c88e412525ce5200cb06561a1d/gejesugatif.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/16549848244.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087437920160---8868334070.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/milivetiribotere.pdfIn PDF document text
    • http://iwishop.hu/file/39469897590.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9e386506---7637428161.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zuganelajapenolutiwo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d94f1be6---vamimawoju.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sedixapubamafugavinawafe.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/daeee5781a84482f02fd8a79bb18f900/ravabusuzopi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/60747230896.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/79908307183.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/99497218203.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_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10472 bytes
SHA-256: b238522f922fcb8012d5c6f12a40cf162d6892292639dd67369bfbca1a4a74c5
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 17896 bytes
SHA-256: 26d9fcdb431055f14e5eef0b793240bdf4cd0539a4d2dc4bcad80334619b16a9
font_02_sfnt_off000131ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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