Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ed2aec4e534c24…

MALICIOUS

PDF

115.2 KB Created: 2021-04-29 23:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 61bd4862cf91343053a92b52066932ec SHA-1: 5e768372927129b8ec94708269774f61798c5f7b SHA-256: f3ed2aec4e534c242569973b896638bb9953f35453be5ccf2869c9cb83a7c14d
176 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URIs pointing to various compromised websites. These sites, in turn, host other PDF files, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ff3010622409499e3ffdc9ac07404bdd/xexexaliwenozonaxidis.pdf In PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7627bd18f1921e0f4b3adffb4fb3e41a/1424895396.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/89852203b8e2d6af214d2ea0d7e6c211/wipegemamozez.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823d3786156---katixapoxusuti.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ftad98spg0ca3t2fu2j6kfekk1/18188249749.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861fe2689d1---repojopufutizok.pdfPDF link annotation
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/13f2ee72b873157c7fb5295954d9f98e/81715022791.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa82042d2d---kobekitelutifidexijefodi.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/28a9251540dbb1ec708a90a0c719aa29/95809513641.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/73deebedba081dc5a9c94b3ab4408eb7/gofotesozenudemanixuxugek.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/80sa3p3ot8aptdort0eoj8upk2/15400681952.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59a84b172---walemupowapidub.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca674b8af---36691728850.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03af19890---25705468762.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735f7abc290---94621083105.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g1jtmodg73br9ricsa0rm6u39f/56273578396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+ndk+assets+%25E8%25AA%25AD%25E3%2581%25BF%25E8%25BE%25BC%25E3%2581%25BFPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 53404 bytes
SHA-256: 936c3989523062c350da25e0022ce640ec21b3d7174147865ed2e28fac23fa97
font_01_sfnt_off00017a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A3C 3760 bytes
SHA-256: d6b204021450aec901a14cae579972b2782aa8e9089630ec10970959f87ec8df
font_02_sfnt_off00018792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18792 4840 bytes
SHA-256: fa7332b0a14347ac66f367406862a54757adbe682d836db5d5b70167c99da3cb
font_03_sfnt_off00019814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19814 10532 bytes
SHA-256: cdfc1b1a2e185cf58612d630565687c385bc9f4d4a5f5bd636ffe969b1d3dcb2

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