Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea971316366b9c23…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 10:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1af7b91cc9ea189f4d590631d6dd17b SHA-1: c3832035c16494554f67c8d2eff19d68324d2929 SHA-256: ea971316366b9c230da55c984bd47145fb9176e11e9aeebad3577de52103aeee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external sites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious classification. The ML classifier output of 0.998 indicates a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=zombie+catchers+apk+hack PDF link annotation
    • https://chp-travel.ir/data/file/golare.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jejuraxaluziku.pdfIn PDF document text
    • https://jjpremiers.com/files/lunewobuze.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/1214784734.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210908_220137.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/ruxigexutafi.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/xoxurigumelabizikazuwonus.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/50levgcl4ac79fi4rb72j5os20/3917346675.pdfIn PDF document text
    • https://onlinendttraining.net/files/43201431193.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/dibak.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/46c3ee362de6bea1b361f687f73fb724/dusebexosimurefetidiba.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/rusakugaxetabewosepe.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/siziwenosasaf.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/72840797172.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/fukesizojolalumuvunamu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a57cb0686---wuzile.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/tikexiduzikijejufiseleri.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/57900263871.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/5800553241.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/14779200779.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/wipabukujevuwogorete.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e7ff1641---72629868824.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 17696 bytes
SHA-256: 9d50d1e812ca0d004f66f42b0973ca16e43599a497178d813fa934bb73868a5f
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 10684 bytes
SHA-256: 9009d5ee62698dc4669bc09359ea84c62fd10aaae79533e2058b9f4a97efc9c2
font_02_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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