Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a72130648741c9…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 14:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ffbfc28bfc89eecc426e77b9763c2fb SHA-1: 52c3adc177efc61935b08fa702545483adb956de SHA-256: b0a72130648741c906f88782ce08b75a22dccf7bb6829071eb1eae186be4b412
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://dedanskecasinoer.dk/userfiles/file/68457374812.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/49122122035bd2d831a3b043a4a3d9f8/30085402850.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3dcf8af20---90674060527.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/garujuxe.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mofudedogixi.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/xufis.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/63869197478.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/balovataxojoximepofipo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acf30d1f94---34157028983.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/32129158886.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/kipawafaxitusiz.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/gazejatamuverata.pdfIn PDF document text
    • https://123natura.com/stockages/files/zufirezewid.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/55712198924.pdfIn PDF document text
    • http://flexa.cz/docs/file/wuxufejowewuworixipam.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210917_100818.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/nukiwozedatez.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161379df149392---61131019672.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/gexugefufuxunajomepuxedub.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/pujumuvukigot.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109151333325373.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/rixokabafeguxogikuvimo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614adedae5050---20759783636.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/dibuwawumawejinafavozi.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/60329260568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=drama+games+pdfPDF 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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10384 bytes
SHA-256: 46e6208597f0915b5f7121bd73747f5aa4bd29734d509e773d20cb463322597d
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 18016 bytes
SHA-256: 0d32b0067cce53240a532d258bdf7428bdb7105a26342da2fad67bf445d599af
font_02_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1