Malicious PDF — malware analysis report

Static analysis result for SHA-256 7744b8a34587c9f1…

MALICIOUS

PDF

78.5 KB Created: 2021-08-15 17:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f7d1e5b2dd5f5d27c349eb9b0826d36 SHA-1: a60e746f6a17071e59489b337894d93a1f0b3be3 SHA-256: 7744b8a34587c9f19eed4578bb210caf3d0c56cd8a64bde611fa6e6be7f574d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://cructi.ru/uplcv?utm_term=descargar+peliculas+gratis+openload PDF link annotation
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077841b02200---75542720465.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b34369203---jukafomijowasilogej.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/37943102564.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/ribaxazizenusefawavipoxav.pdfIn PDF document text
    • https://nadamasristorante.it/file/50200493698.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e14b9f99---20241753074.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/tezum.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7743c4336d---kisuvot.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jdt6sg2b8p2r1g3s108ppht6dm/rubivefozegeku.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/96940987968.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20208439455.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/83647103568.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5e4d1347---60228118059.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902f4810960---38567163311.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e47566ebc7---28503221187.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91fe39fdd3---40225615819.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/jutovituximaroberav.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6bed01915---30767294925.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/165040cceb3785bcf1b18f40e3e2c04f/60633511709.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4v7fsp63qnqocdbuh8h2sidug7/laletid.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c155a73b80---juxosodejamigewewumem.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/kimotazi.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/23882560378.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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 17488 bytes
SHA-256: 2e0ef3eea0bb9743baac7c6090c165bca8d2d213b697584802cc35492c5ff17a
font_02_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 10788 bytes
SHA-256: f7833c27ca886efaace180dece05f0bfede46999fed1b1550c3a39b97cf7b09d