Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e549db3986fd1b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-03 03:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 126c339c739e9bf11cfa294c1e3aa9f8 SHA-1: c88eb66b542e9fb9706e7d5831caa94d6e41482f SHA-256: d5e549db3986fd1b5b9f739562bba7b44fd60d8b0ac3c2bf0cdfb5f66bf14097
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress uploads, further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://servauto.fr/img/user/file/xajobojigurebibenez.pdf In PDF document text
    • http://apple888.vn/luutru/files/mijixumepajapasiripa.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6bd94a05c---favexasu.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/bekagekidarinutax.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/falamilixof.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/nesejozopusulizazo.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/poriwigigavafuwaga.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16082a576c4890---2920079443.pdfIn PDF document text
    • http://ruresept.ru/files/file/97074791909.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/13340003504.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/lopedijavuxatitozunop.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/77691855520.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5042448c9---72943938294.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/42349007452.pdfIn PDF document text
    • https://landi-bg.com/images/file/xobakagomafutidadunij.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/ginukewimoganezasatane.pdfIn PDF document text
    • http://coumert.com/images/file/notunirumusosewekibuf.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798470aee9b---16359483641.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/12886022528.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/64413410088.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb63eceed---vexisorumoro.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/8609378135.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210724160905.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vezanevulexagilere.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wugeduxavof.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8fe1ad9---xativotifuzel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=carcinoma+de+c%C3%A9lulas+escamosas+da+pele+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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10968 bytes
SHA-256: 5d5fce15088558680e59c1f62176bf704332f2b83d12c2cc566d25ed166096c1
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 21104 bytes
SHA-256: 8c51853c92f932840c059f0431850f5bff2cdb85230ff391c3fcc84571eb3521

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