Malicious PDF — malware analysis report

Static analysis result for SHA-256 1340808d4faeb5c2…

MALICIOUS

PDF

152.9 KB Created: 2021-06-13 06:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7613c71a2223cf2dc0c3bc7a815c7a1a SHA-1: 77f77aacc39a1045d0e4cdc888dbf96bec9214c6 SHA-256: 1340808d4faeb5c2f7b033ffd5432b13430d9d9f21277adb486e086aab828a93
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 0.9990

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://nomylo.ru/uplcv?utm_term=fairy+tail+100+year+quest+manga+online PDF link annotation
    • https://btegypt.comfile/numozokunotaribefaxu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607654d7304b5---16858462124.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/67284935955.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c132252c1f6---56712423240.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/vawexu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160720efb6688e---vovetawilijepo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b469b4380---66178908497.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/71203cdb8820d2fd0b1cd575ff93c431/fosojilowig.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/43a76071b11cc87d25c6102ee4581538/forogurokaxufapise.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c895ae1a962e2181de334d0112701f4/biduwitigelife.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d06a7302---28756871777.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd7bf0d37---vatinulelegaxev.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/kezisade.pdfIn PDF document text
    • http://nktrading.qa/file/files/widojikadupex.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/rfpmguh853qokaj5dpagc35b39/16942662929.pdfIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000124f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124F1 77272 bytes
SHA-256: 8316bd838aa80d9a96ed36304753d095dc59af214f4b9feec3dbb994cc2c53cd
font_01_sfnt_off00020ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CED 5264 bytes
SHA-256: 39eec1d02b0aecdd555f8019f7961d2b568d970a8a0f3cefda7923c4e64ce2df
font_02_sfnt_off00021ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EBF 12492 bytes
SHA-256: 46e0223b355007574be943fe7769b16e6192334136808e4d4e5d233a98c5eaf8
font_03_sfnt_off00024782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24782 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e