Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc12728bd804257…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 11:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09cb27c2b53ee3d73fdfdaa8f4f3f4ca SHA-1: 15db942149912a1f06475ab35971534153b0ea51 SHA-256: efc12728bd8042571b24e7a52f0518fbd2afe2838567832a0bed265d6e744907
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some pointing to IP addresses and others to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into clicking a link that leads to a malicious download or site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=redmi+7a+software+update PDF link annotation
    • https://hoangmailogistics.com/asset/site/files/fukivaxixerufudowere.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/gilarifujugapeg.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/jibuwipapo.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/71899851782.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/40886129617.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161328cb0c1812---mejus.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/zimubig.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210917150310.pdfIn PDF document text
    • http://snft.ro/media/file/kolujapirafes.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/jogaxeravazilefamanapesud.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210908_205909.pdfPDF link annotation
    • https://aspirecambodia-edu.org/userfiles/file/87222147476.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/9032413566.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/wimowazexezufurov.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/60941797908.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/tulamemonivosikituxob.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xejodusatisinawebox.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/rojonazexugitegux.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/pikeli.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/nudofewawagudatezolototog.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lefoperiwuzowan.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/46178017937.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161302f781806d---27061131615.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/76043125569.pdfIn PDF document text
    • http://unseretochter.com/images/file/xijunugoxidekoju.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2b8ab22f3a7002fb2dfe04f4528f055f/ruxewude.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zixejimetapujolaxejox.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/96166953046.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_off0000b6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 10788 bytes
SHA-256: 1e5d2908e79c85e5a0cad0ef83ffb3ce4088523359bbfe65b3491d1d896b349e
font_01_sfnt_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 14232 bytes
SHA-256: 3e9edcc242cbb45c6c125c8331f01707392cc3dc9ec92109b5f6bcf72a2ea49c
font_02_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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