Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ceb5e289a795d4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 12:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f3b233ef71d7be8264a76d3112096ce SHA-1: c14132d0367abe239c2a330adfcb044fb440a161 SHA-256: f9ceb5e289a795d4a6bdd2ef321a5fdae7ef3b06bb824ac2d00b8cf1f39ba4a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The primary goal appears to be directing users to potentially malicious content or further stages of an attack through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acd2e8ae3---pewelusivelidagerejafasa.pdf In PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/fe79eff8e5dd535642b6be9d38f40da6/govobolazijenasadamepe.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/dosinulenavesugiluwuwajax.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/28901087122.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/83930081725.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7512e858c---babujiwefilujomuja.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/22658867491.pdfIn PDF document text
    • http://suurelepa.ee/data/file/93593878244.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8eeb117be68189db2b719582baef9aa1/wegubilidosekalegowipuku.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4251933a2ab9850ccb8b8de1f22ccac4/nigasefejowidu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c5493ed960f1e697902fd26d95661b03/34282673867.pdfIn PDF document text
    • https://soechi.com/userfiles/file/76157825859.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/valupibekugakimif.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/28398855937.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/65057278596.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/ladurufatiwilek.pdfIn PDF document text
    • https://cet.sk/res/file/kapewerimuva.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6d4d77aaf---46768156409.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff90cbc12d---davitugekekadadom.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e485bf177---nalogolifutana.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160843b3d78313---61989619525.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160898ae6e6217---fukasijidur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ntsc+encoder+and+decoder+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_off0000d605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD605 17300 bytes
SHA-256: 157dba87565a92a212e684c7426867da7a599426a0a5ecbe24dddd09c5ff921c
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10452 bytes
SHA-256: 14ccddff9c10be603276c75e3a0c69290847853d961c5586f12df5be7f00c95e
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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