Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a95794710f928fb…

MALICIOUS

PDF

70.1 KB Created: 2021-09-10 14:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d9fd3eb10d5ac41960f1f896c6ad97e SHA-1: e8e2151e8cc1675fda6cb6f30262c4dbc1d5e1af SHA-256: 6a95794710f928fbaed917deb8a5f20f29f24ccab9f6a8a6c352f93d74057294
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple external URIs, including a link farm on disposable hosting and a link to a compromised WordPress upload, further indicates a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://gmicropilotes.com/uploads/files/40711041046.pdf In PDF document text
    • https://priscar.com/documents/files/gamekopelaxavuvokivi.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/23301527046.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/wegusosilijipip.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be81d19de---52525663159.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6136f1d437f04.pdfIn PDF document text
    • http://enewind.com/pliki/file/jimanunotikefedubolu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/82b71i0qsspa1vtrks5ot2ac9b/zudinesosixezas.pdfIn PDF document text
    • https://questyme.com/userfiles/file/sepubuweginikegikudi.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/fivosigagaliluloxab.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/duxumafabufipisijelixuw.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/movit.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/rezibirerexosuvuw.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/badojirovubererira.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/rusazireluvusobobogek.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/lukoz.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/juwokuzetakevut.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/65212666834.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902075811.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210908054334.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kdt5j5937jml1d8f50qdm11s17/sogoxebebososi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/tegunebozodotapomom.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/41715028582.pdfIn PDF document text
    • https://pmms-online.com/assets/file/5429068316.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/8779951711.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/10521846357.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/mezuvapidekuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=safari+browser+free+download+for+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_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 10548 bytes
SHA-256: e955513bfcafc4814d944ba0b1cc3153b45a96a94201db89d73be8a559eb0c62
font_02_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 15492 bytes
SHA-256: 5b164ec046bc4d490666d9406437720617eefcaafc324c636190a89f96256ccd

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