Malicious PDF — malware analysis report

Static analysis result for SHA-256 71049ad0ce4a2f81…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 08:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9755bc799cd08893c81457c2ec2c463e SHA-1: 661432a71144769046ad107fc8a40fed9352d758 SHA-256: 71049ad0ce4a2f8121f01b71a0d59a88a2d77a63e9e7afda52db50c8316e61ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/125f6c8bc35eb233f45ef598ec564853/pirenazetupubujedena.pdf In PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/59140949244.pdfIn PDF document text
    • https://jagominum.com/contents/files/suwakidasefuwidu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3a2320facdc0208d6e77a73962d0c1f5/ruzekogurufurivoguji.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/ligamakorideniti.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912070851.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vober.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984fe995f6---3519280981.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/56517402243.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/raduraxozepogisusenosimar.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/18964046578.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ccefb441f76c65b86856d01fc2555e83/bifuzomorudolufig.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/sufefakutawefubilurivin.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/supazimamatorutofavegax.pdfIn PDF document text
    • https://aksusu.com/upload/files/vidojabafoteb.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/nonanasasamezamete.pdfIn PDF document text
    • http://artio.pl/files/files/90893131419.pdfIn PDF document text
    • http://tencanpowder.com/d/files/41506732215.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/061337131850.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/bugemixajofoteg.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/93464868147.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ed36a5a0---buvitisemudadipeliwi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/57847772259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=clear+downloads+androidPDF 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_off0000afb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB9 10260 bytes
SHA-256: 821226fa41465d2c8054689bfa5096431b9a97c13abe12b4b2183818d4ad1d65
font_01_sfnt_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 14560 bytes
SHA-256: 6b9bc26b595a4cef17aea2d94f6ccd989fa5be9bbf4e869e3087b14cfb53a17d

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