Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e1b355ba070966…

MALICIOUS

PDF

99.6 KB Created: 2021-07-25 00:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a36c7db170e596c697965061174981b SHA-1: b12c3df6a8c3fe908c66e707a36e089dc35b4b88 SHA-256: 84e1b355ba070966d2703b9a3147b1365b049e6727cd38fb07d8376bba79e662
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that functions as a link farm, directing users to various websites, some of which appear to be compromised WordPress installations. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flags this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://adveotec.com/img/file/lizolonemidaduzexud.pdf In PDF document text
    • http://tandartsindex.nl/images/uploads/winuwuxemifabixujeve.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/11035725956.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bf5573dd---94142699970.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/92881228326.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jumudutotiwekakob.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e30994a8e---mukikavawuberimeresum.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db6a6b73ee9---42537307388.pdfIn PDF document text
    • http://charivne.info/images/file/74350444745.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4572e2fca6---59286027243.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/74912237398.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d05f7239744---37950045976.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aad5d1c2a---45751855480.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wavisirajafu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba055128d---gevexezotazoravi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da94e87a1c2---kosixiw.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/0f6ce49f53784398339541162676d114/77449688911.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/jigajamuzinuvajaxaku.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/23b80c39210e44b93af38609b1fc61c2/6397871989.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/42510709633.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ufhib6v3tlpsrodvsmmcluqg6v/90933976605.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n5og22efqr1fuj9o22lhr0cv71/82083540410.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608978046a154---72479428081.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3eca974d8087c25ef016132d21d86514/92802970371.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/65523888220.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b2f02b5e76eed901ee03c1dca8a38fa9/67226679795.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/77150012972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+escape+prison+break+puzzle+answersPDF 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_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 10892 bytes
SHA-256: 1a69f9a6940e6dbc90005cc5c09933d6d6f103f445d7d9650598ead24eee3fa5
font_02_sfnt_off000151b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B7 17300 bytes
SHA-256: 583d45a4903cb10202160a5eb20d6fc9355841b734585519b2837f094abec57b

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