Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fd0cff33b02c0d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 02:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 850d9314c0ff2682381372ae8ef3e46c SHA-1: 9a704583e4d120fa1b90133d6147eefd5ae7e71b SHA-256: 79fd0cff33b02c0dc06bdf9549502caa4994605ec3ec184c54ba7f7ec6efadee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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://inwebjor.ru/uplcv?utm_term=cisco+cybersecurity+chapter+3+quiz+answers PDF link annotation
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/dajutosinixozuz.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/tobaleba.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b526d109---vimimusegovanerejuguxeje.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eaa46d8f9---91901586641.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/32289949497.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/80860352720.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/giwofarixo.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/vemakifut.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c2cc3acfd669098636b0e9aba2df80ef/fedusomatopuwasegugira.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe7dbeca47---kajoxozapoxukib.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6a0d57b1---6018985667.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f0bf222a4fc24abfa37b0bb215eb1a59/83220907244.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/fsupamqm5drvik9rtuofgg33ng/78356174493.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/pupim.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cab23b5ac7fb1eb15d5946d3c8536201/zewomik.pdfIn PDF document text
    • http://nfc.soo.jp/file/22326416706.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba000d1783e---kowinuzadikititu.pdfIn PDF document text
    • http://solo-enoant.com/content/files/files/91787372456.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/xuvezumogesaz.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a32ec6cb526---53024333220.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/voxapuxorofazeko.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b1844011e8a82cc9b8944ba7c8d3a398/80615009441.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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 11272 bytes
SHA-256: 29f9615a06374e36b87a68edc8f160ffc4399592a474f93410b35b0a6e422820
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 19056 bytes
SHA-256: e95bef900a83e17e3b9e226c18b0c69cf1519b40b7e832f954cffb1ee8b168cc

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