Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a1c06ca5ca50d2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 15:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38edb2ddb77403143adf5a56b5542b9c SHA-1: 798a99f59b5e1861f35f6cc4acd59a0d30bb76e8 SHA-256: 55a1c06ca5ca50d21e2e95fb4eda563a57691e8fe9f1b06792b0217b3c3e536c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript could be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://karinameal.ru/imgdish/files/12147822188.pdf In PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/paradu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gejuwajevaravilejig.pdfIn PDF document text
    • http://holzweiss.at/zufukemasa.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/24813062571.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/78834144689.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b892d53ae---72613673583.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/842554934613577b8c905e.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/doxek.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/josukidedanutalalojazu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/71350653806.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/80543757718.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/kefunetaxi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af8d3ccbe---xifujirumeg.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/38331640388.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/novuf.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/337bc93924116390f95c4feda26eb3bb/fomirewaliviwuf.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/mizomipopawerepikigomo.pdfIn PDF document text
    • http://quranday.org/userfiles/file/68809386836.pdfIn PDF document text
    • http://rongqichem.com/upload/files/ritezodazajesid.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/f644e4dd84e8253cdd7d4b740c8b80f2.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161384b0bd1e5f---kuzikefatutaga.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/suwina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+new+version+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_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 10568 bytes
SHA-256: 0d6ccbdeaf8dd9555fae12e576419a8cf68656726d621a327af7509105ec82d5
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 17504 bytes
SHA-256: 63eabaa1773373e8af28d24d17da29a326de7d68ba2dd9e8d8767e0e0c78346f
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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