Malicious PDF — malware analysis report

Static analysis result for SHA-256 8747e536cd55e632…

MALICIOUS

PDF

81.4 KB Created: 2021-06-28 23:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1927baf6bf525e8c831bcda05b4101cd SHA-1: 554a1a234c04a85e58fd77ef9638c4ff88d5358b SHA-256: 8747e536cd55e6329d8eb00551d33373cc34bcbf027e680093c908b8d7f266fa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://twr1115.net/files/fckeditor/file/50038576915.pdf
    • http://fsanaq.com/upload/file/210627185403671876axk8016sg2wb.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d608d5e94eb---77619285530.pdf
    • http://lucann.com/Upload/file/zakowidubixilenimixenefa.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f38d26439ee8fe5725c334502e6cfc25/36719537788.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be6cdd64f4f---97547155503.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/fc4bf9a15d03e50334670a1fd1a68998/zixobopubuxapitoluni.pdf
    • http://rhondachem.com/d/files/63174178237.pdf
    • http://nuraski.pl/wsg/userfiles/bisanefazipesasumil.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54f7633ad---vajurumofam.pdf
    • https://agrolliance.ca/ckfinder/userfiles/files/galoribejuweduzubafu.pdf
    • http://novichiha.ru/pic/file/putar.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b269ae78edf276a4010d65f0d6a166db/lozevesibibu.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/1052256107.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/d0j12o039jtr25m4618kqurcsj/dubamonaziwugilon.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0d8054590e0cd1fa9494956e50b9026f/28741109018.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m5esqn8np3cq65j56lch2jrvb1/2813377977.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503052525479031.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9896890a---17171350382.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88137508ff---wezedu.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b76495410efe0277657f85272334be63/kuvituwefujudawosupaxo.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160929e00e801b---24644942674.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/misobaw.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/nlrfamlkfa282m6hesf4j9gjpd/webogeropavidunij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=haynes+bar+and+grill
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db68.bin
47de7b1f74f377cde8cb4319758e135a6f99c3e7de8d05847feb7122a47720ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 17488 bytes
font_01_sfnt_off000108f6.bin
733339c407e1c174f6c0715c46c640c03109f9f0f9ca8b54fb9c93918d9bbdeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 10452 bytes
font_02_sfnt_off00012085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 16792 bytes