Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0e48a5afaf85cd…

MALICIOUS

PDF

102.4 KB Created: 2021-07-21 02:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ebc6ff8cc4cf05417efc071ec8aa1a1 SHA-1: 9e95d9e5d618f4a7ee92d5865b435d11c44d1500 SHA-256: ef0e48a5afaf85cdc1232f13a8cf4737f65411391fc6d70c8a0e3e295fd19d79
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://talk200.com/admin/admin/uploadfiles/file/zixalejepipoxutiki.pdf In PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/49471952596.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3u302287qt4u6ppqvopvfba2bt/saxuvatotavudopemekanul.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/jozutofagejokejigup.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607930536a1a0---76122423702.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fubogabo.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/64639422367.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026a7f1f88---18029196606.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/vodujakeganu.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/kisoxunamowenibufured.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/eff9de075e4c12852b9e1cf3b19cab3c/61958649973.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/90798300561.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/sowelodelo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hfn8seofn6334jlm6ht0ov1fi3/64558729577.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/wagoko.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/50193406500.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f5564850---tusab.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210714075947_ly6s3w.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2aa5ea878793872494ba0b25140b47c3/sodib.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/5182995907.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/4d6df0fb7933524ed617ebc39a1ff4ba/37938662123.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46e11d67c---paleni.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106131358.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/26246994086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fraction+math+problems+with+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_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 20092 bytes
SHA-256: b12748bbe6791c9c4b09c3a95fc75709f74a453b3e1bdb0409574be808dc7867
font_01_sfnt_off00015b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9D 10844 bytes
SHA-256: 72b07f0e8a66abc87b3f1a43c8b4a3b205a9c905da93101a13d2736e17547b08
font_02_sfnt_off00017446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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