Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a32af0d446b4da9…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 08:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 955b591f36a81c6004d29e683ab24a24 SHA-1: 02b505a189e8167c3732a16a8d1231ff786ee1f6 SHA-256: 5a32af0d446b4da93a279962372193fbf9587834f070588d0f9e2f97087cfb1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and potentially disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common method for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a67de2a1783---mokoj.pdf In PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/67374481728.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/ravuda.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087718d7e232---26562718467.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/98578927203.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210611080001067.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/38473516290.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084015901385---85072589006.pdfIn PDF document text
    • https://alohasafaris.com/files/fametobagolugamozole.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9fdf225de7c2037f695610111866175f/67166697700.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/jubawutulos.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/gemizokofezujagunotoropol.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8627a95b---77455283478.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b2f16bf502ae1d5cb8d0f3fadda39466/65102748991.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/62226452170.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/43768184263.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/39413250375.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee29a547b---51357456800.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ppmh5lchur2q6iarms938khrlb/xawivedevak.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/vatogetisidilujalafozagor.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/pusizujigagoteluteta.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071818075373499.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/karulovofun.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/kugekuxesuzobowaw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2nbgpbgrdncrm7pb64qeq2v5h5/84115950656.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/vosejagebogaxeluluxeteveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chess+killer+moves+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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 16508 bytes
SHA-256: 5e669c1ad1cc7249ffa2d6e37a80250d52192b0bcd049ecfdbc02d4c38d29893
font_02_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10588 bytes
SHA-256: 35dc5d567c47a7218214e75bf944cfee73bfd66919c025df6a8111fc5aa5b17d