Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a15883ff1ad5da3…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 08:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af01ca474de246a193babe42c2d0c543 SHA-1: 8a7c8531291c4129d76871baf2333158c89fe4ad SHA-256: 0a15883ff1ad5da3684748515dff4cc4a0c1e375148064476bb9c588962d4eb2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic firings, particularly 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION', strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130630463820---mawufizavajexawojuporuz.pdf In PDF document text
    • http://kirakuramen.com/uploads/files/gefadumexikosavumuzuk.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/bewomodob.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/nenipujaguvuzudenavirimaf.pdfIn PDF document text
    • https://interconformity.ro/images/file/86990998769.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/sitonuwipinisobitev.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/nipalexujujekuxitenusuv.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/5231845161.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/37019714762.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xebupesijogazirolanubitiv.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/64537772579.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/30997740748.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/piroreli.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210919095253.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/6135377050.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210907084804.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/buderamitovudevu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f67f75f1f661b630eda8de64e80469a/zivozomuwir.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139249f9568d---sirekolonisibobujakupedam.pdfIn PDF document text
    • http://st03.it/userfiles/files/filotezawetuvupowuwo.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/vibevudutodobine.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/70113614530.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/88478440750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=call+of+duty+warfare+3+torrentPDF 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_off0000b904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 10592 bytes
SHA-256: 200d6d96d32fe920f114e83d5e3d8bae38e07b1617856b309f30bd0eb0cdb323
font_01_sfnt_off0000d17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 18852 bytes
SHA-256: 1bd9a6e557a9b72dd6527471ffcc10ec3b81b10aa95ace3ee691e3bbfdb7827d
font_02_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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