Malicious PDF — malware analysis report

Static analysis result for SHA-256 997a07fe1611ca10…

MALICIOUS

PDF

74.7 KB Created: 2021-08-27 18:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e93169a8e243729302166b314aa9da2e SHA-1: 5a5bddc375dbf6f3e38c26186151fe9e5d58032d SHA-256: 997a07fe1611ca107faf6718448455b052b28c7acac7a64676f4a98e8953c1ec
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing lure or a distribution point for malware. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to encourage user interaction with the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=reported+speech+worksheet+pdf+with+answers PDF link annotation
    • http://jpind.pl/userfiles/file/sonezemubitujemu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/cbbd2f2f23adc2e0e1124065dccfcab1/panavitidowiluvofesi.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/mawivibiniwutebaxewavo.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162577957346.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/vemezasilinogud.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/7694753040.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/83946677544.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/sovukeseranoramib.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c8418be17---vademajovid.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8671f671180f8a4db71a11923fd89a65/wonunudinamofadivadibad.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202173004312184.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///3382628555.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/62051733819.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/gungsencd01m2qvd9kv76q5dge/71829818717.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/79181963129.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/vuterigudisokususawiwu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042913380073499.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/mixerobamiwoponavafawuk.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/pogerefopevasofike.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/xamogewozexabikutolitun.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/ruzobidosokisubofol.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/10cf5a587fa944cf36a118c6a960d2fb/23545381831.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aacf07899---setuzesemurasu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aae21687b---70938540006.pdfIn 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://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_off0000c235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC235 10896 bytes
SHA-256: 5d039c5b9c2846acb9e7879c533bc30820b39da5ef6e0b58b0c51e521dbe5dd1
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 16060 bytes
SHA-256: 6670dea591cbefe1a797aae6cecc7b4ed4b43f999fd8f26c4b15d7dd3f4b85c5

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