Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da14d4ddef5973f…

MALICIOUS

PDF

83.0 KB Created: 2021-08-04 00:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23831c94f3c834c7b60a804319107074 SHA-1: 7f48efdb152f516197e090552dc00ffe18212718 SHA-256: 8da14d4ddef5973f2025bd8cf32c523282b1e919eb18047ce8627837ef7b30fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and functions as a link farm pointing to compromised WordPress upload storage and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users. The presence of multiple unknown URLs and the link farm structure strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://shukokai-voves.fr/userfiles/file/14652150014.pdf In PDF document text
    • http://cloverdiamond.com/file/65713956594.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3333f3b9---23995710081.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c95bb954239---jefugatumevoxenosexi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o9jf4t0co7482pinn6g23ef934/61322784973.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rit91qjnrss19rprn0dcjdfbpq/75841050747.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51fd4598f7---tesiju.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/51768064862.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/65ab7ee92d2c2afddaceadc42774e1e6/mifinel.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4abb5fc71---reles.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/lidibimuferuwusi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b02f203a---79774557410.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fa72e614aa24f689003eca2964bbccd4/visilinawu.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/munagaxigidesukiverotogu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/tolag.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/83616413012.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/33775687376.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160876d6fd35fa---1101222084.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/84921350949.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xibuxamuvusatulifat.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161039c8be3ecf---sasimotolagewe.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/54789099976.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/989976297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bonding+cast+ironPDF link annotation
    • 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 17992 bytes
SHA-256: d22b8f163b23a16e39dc0d7bf327b6bb061f6d873ab6858c2bd6888a0220426b
font_01_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 10420 bytes
SHA-256: 3df9a5d247e0ed83634224ef89a421ee5b8cb1af8c525d8ca2137098d71357dc

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