Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca787bc58fe3d7e4…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 07:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21b6ed2a760fa06faffc47906f1e28aa SHA-1: 9a8fa938af5f3172cf763d797a90aa633d20c2ed SHA-256: ca787bc58fe3d7e48adb4d6fefe1092803426278b7a258095bac915b1bba1cc7
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious link farm and a phishing lure, with a high ML classifier score and ClamAV detection. The embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of a 'download button' heuristic reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=save+pages+as+pdf+mac
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5901fcf0cf---moxomewireko.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ac75e7273bc1814b66700a3101d30c44/11909208917.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/gifurasasasutavozofov.pdf
    • https://dobre-akce.cz/media/files/file/91721104005.pdf
    • https://lescourailleurs.com/upload/editor/file/nulunozadonazagisov.pdf
    • https://muratay.nl/userfiles/file/68296976616.pdf
    • https://west-holding.com/userfiles/file/zimegemutaloge.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/656us4ba6n1occjo63pmuf9hcm/xawose.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/71f6a724b14153a8b252a34d096a2b9e/sipiv.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/432e0a3eae3c33a8e310ab7adeb9b58e/modivovufedakegozubiko.pdf
    • http://derkwoo.com/upload/editor/files/18007429924.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sb4adkqevca144s50ial1t12ui/xavuxusemofu.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e03119e24---xofiw.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33df58ef1---medukivi.pdf
    • http://www.sport-konyv.hu/userfiles/file/pokofiro.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096435f23b31---87398460542.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079eaa7aeda7---47881107067.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ad31a997---tiwebewisal.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9cb2155e98ab6ed27e6547ec2b23b8f3/50010056996.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/341ff755ba92af38cd5635407fad005a/lujasedoxabati.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4a0eaba213ec49bc3f17bd70beb8b399/vexokurilodik.pdf
    • http://euro520.net/userfiles/file/1623113107863134691.pdf
    • https://lesura.net/userfiles/file/fabipowilevirojosatog.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f8ab0d866d11a4d266defd36769c85c4/labidabanami.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1kj6npgnrlpn6o5oaitkddbcg1/50222986610.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca37f3c96---66164165370.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6b303183ee79b291b1820fbf0016f14b/94758202415.pdf
    • 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_off0000e995.bin
8094c2c7ceac8b6f1cdf5f2545ded5438fc0ae589152149b67f71c2c844e998f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 10544 bytes
font_01_sfnt_off0001016a.bin
2d494f323b43caa163d2b5d64eb52b190862eb3067610888be752f89b094e680
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 17880 bytes
font_02_sfnt_off00013030.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 16792 bytes