Malicious PDF — malware analysis report

Static analysis result for SHA-256 b202b4acd8522758…

MALICIOUS

PDF

151.8 KB Created: 2021-06-23 02:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 310c7b94b3e3cafe0a284cfbe4998e94 SHA-1: aba972ac94b49889c9d9eb42712b53271822ef5c SHA-256: b202b4acd8522758049c248672a1fe7af8165855179e4e1d9f5ee3fe8f145850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=maharashtracha+itihas+11th+std+pdf PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7948dda4b59d09db494b4bafa81b7d44/fumepirimodoni.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcca8b5647---46135330483.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c332e966---89777043870.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b214b4fff---buleguvidiviwati.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2870006b0f---baxiw.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/41f77f507f00128077f7342d0301b4bc/gusujadewumuwedos.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/62065185508.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4f268c874c4a8a35072ad1b7b9519b8e/xadanafijika.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/76133266104.pdfIn PDF document text
    • https://zhansq.cn/upload/file/wadasidojir.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/99923a5b393d3f485f1d4fe5d920b342/87451313206.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d953571cd9---39185245504.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ef483cda23df7c234ed7f95dc5cebae/kizupovevapogezawubiw.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/89497925658.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/poximuxixik.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001f477.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F477 27660 bytes
SHA-256: 12446cdfa9a507dd9d6231b8a11f9dbe7619159d8c427f8a7ebec0b9d35220d6
font_00_sfnt_off0001b2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B7 4724 bytes
SHA-256: cf1594d244023731357ec3c3e5f0d4ccc9b5cdf43131afee4b117600f2ec8f5f
font_01_sfnt_off0001c2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2D8 10420 bytes
SHA-256: 9f4f5a0d4507a00905896bb6fcfab9f556af412cd7fdc04e49e7a02941234037
font_02_sfnt_off0001e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E676 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_04_sfnt_off00024159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24159 6296 bytes
SHA-256: 1661b5cb7b173fb12b5c3e5bcbb377521dad699b7e8a91a82efa70880195ec37

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