Malicious PDF — malware analysis report

Static analysis result for SHA-256 d363757d16a27b64…

MALICIOUS

PDF

107.3 KB Created: 2021-08-02 18:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2db4637b3b8d8dab341b34ec0e0c9835 SHA-1: fcbb4d6ea1320207488a51b3f987dcd30940391c SHA-256: d363757d16a27b6431bfff5380d86e753210e8dfb36f8845e131fc8a17d88c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/v04burd2nurflm8m378d98u8qq/40955333794.pdf In PDF document text
    • http://ehomerealestate.org/images/file/26602660252.pdfIn PDF document text
    • http://canoeing.by/pics/files/65001727955.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48cfab0bb---35506559033.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e0a3addb---41288630605.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/40871809851.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/45c1afbfb6c3627a6a29e0e68fa35313/12823530531.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/95108779581.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/92162333465.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/neduxenenewonodavo.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/diboxijojafokuliluvide.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161041cdb60a45---81784559482.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/18645181603.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8db5e81b---80736913190.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/kudirisotu.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/zakodofifo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608307ecc379a---42224478987.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/kg4vcjl6sser453qj5hgvh97r0/sezimovimizedaloduxuz.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/pawivatebojepixora.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb16083352---fisibimajakolonedijar.pdfIn PDF document text
    • http://tfforming.ru/d/files/22797919523.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/a8snd1kpvoshthsf6m7ec26fbr/83290357829.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/fkf1vfckbfjb601cqffo8emi7a/wuwibewojez.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608440d4cbe12---femadodugozebobiwugewoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=que+justo+en+la+bibliaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 10432 bytes
SHA-256: 3e9c22abbe6ad2f5fd0cecb669be58507fe56f63e39d3c713352e4bf5ec9cd07
font_01_sfnt_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 1744 bytes
SHA-256: fe85e0a8a2678545e8e288ad89090fc3bf64d51d8303fb23b502e97109b2793a
font_02_sfnt_off00013882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13882 18788 bytes
SHA-256: ae8e0de1c9c9b1cfb10058d032433ca04c8daf8593518110146dbc658d613565
font_03_sfnt_off00016831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18042 18108 bytes
SHA-256: 00dc1e837daffadcbe2254d438f69028b9184cf08641c606ffad8d65e695ac82

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