Malicious PDF — malware analysis report

Static analysis result for SHA-256 245656ad21f714ac…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 10:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83b67b34f82764eee901369d5be37e80 SHA-1: 8db08cb52b959f13b973e7c18e6795ed3fa73629 SHA-256: 245656ad21f714ac7f41002ae01126b63db764a85ce5e8d636635b90b80de36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/qe2imqcfkf968d9gbakb9c30d3/junexibupofesididovetor.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/67704b085fd98db12b5a43843309470c/27306973910.pdf
    • http://csc-021.com/userfiles/file/20210623153813_g5hehx.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c74e01aa---2850837683.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0da925582---43603440197.pdf
    • https://rintrans.com/files/9893491996.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/cb7bcb84e81e50957e2259d8440619e6/97002718949.pdf
    • https://signika.pl/Upload/file/28009105956.pdf
    • http://modern-pro.ru/files/file/52732232719.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609875c692c9e---panudavamuriji.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d87be6226---putotakopato.pdf
    • http://border-inn.com/CKEdit/upload/files/mifomakupux.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/pakelepitipitukeb.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b755b8186fb---51154385895.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61648b3cba---lemimokixog.pdf
    • http://pastoret.it/userfiles/files/54846565327.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/f602c4352af7d904e7da9712a7db62df/datofadidagisa.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d731af0f0c5675285c7bbf7ae7e0c4ea/87712207377.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29efabc643---kezulaguzegizexob.pdf
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/jobitupixir.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/386ba62e5b63077f2bbfb1a765c0ad0f/20442161996.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/verurufunesuno.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qjdn1qnldmhcgsfr3h7f5oo8pm/63507079437.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/lvoe1peepd17a8iv6ud2qolc43/fitifupunilasolojasaxozo.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/09dc3bf77a834118eb96ba60f6d14f77/budadibefilujifadigifi.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec810a067---fufuvojo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160900e2e832f0---tujopedofi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=my+heart+will+go+on+roblox+piano
    • 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_off0000f520.bin
e4ec3a859bfe4210b80525e1d16f882010f840f993d0127fdfb5bd942b848274
pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 18284 bytes
font_01_sfnt_off00012506.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 16792 bytes
font_02_sfnt_off00013d1d.bin
be1e42bf828877c182c7aea6098e8dcb79bd74446ff36e8234dab31db4be6744
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1D 10800 bytes