Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c89a019fb4ce653…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 12:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efd547171e5319dc20239b9db45664ee SHA-1: 8b295a15f6cfb769135a18667986d5fe1d781c29 SHA-256: 5c89a019fb4ce653c8157b127e814361609d17ed13d9d7c84b8ee6cb600ff3f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://magnanelli.com/userfiles/file/74807535525.pdf In PDF document text
    • http://traslochimontalto.it/userfiles/files/3921707711.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/53mlk3h9isok412k0au0b09boh/gisafodifopinos.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b487a5a46a---reripuja.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/77482609306.pdfIn PDF document text
    • http://ashioke.com/images/library/File/dexezixilegi.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/58121134615.pdfIn PDF document text
    • http://giga.sk/storage/file/201728391.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/romisiwifazusozo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/8563081366.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/mevitisenokizeme.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d566d6ec9965cf0b79a5d61747f18102/47692130198.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/9786406462.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3565ee3e---65169627936.pdfIn PDF document text
    • http://belst.by/upload/file/rebaxoxipududunoxagobu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3aa74adda5dd296dd11a50b7fbae95d3/gudijojifonebekis.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/sejozusofipu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/97954127754.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/17661076431.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/21553538456.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/goxafa.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a191d9d43509d6983da5552ce5002793/31645064780.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6fe71c9420ddc452d794d5c00b74ee10/lupalunuwifevodan.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kamuzemagiwefet.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/guronezupenofapodipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wbbse+math+book+for+class+10+pdfPDF 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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 11088 bytes
SHA-256: f1ea748f31ba83f5e79fee1a59f0770e405f4b8f4b787b0eb096659ed32ca74d
font_02_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 17352 bytes
SHA-256: 521c27f7273343151b0858b96de2855ba4b19d5fbc141aee99eae99f89631462