Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f8d96d3fd99926…

MALICIOUS

PDF

67.1 KB Created: 2021-09-03 02:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1636446b4a313cccd3bf8b479fbca3b SHA-1: a2bff82ab0a8a746eca04f1f5223193ef0e1eab5 SHA-256: a9f8d96d3fd99926d1c202ae623bba9db8f03a562a55a2076ddc1c8adcc9d5da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by multiple heuristics and ClamAV, indicating it's likely a phishing lure. The document structure suggests it's an image-based lure designed to trick users into clicking embedded links. The presence of numerous links pointing to potentially compromised CMS uploads and disposable hosting reinforces the malicious intent, likely to redirect users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://irvine.songhakbbq.com/uploads/files/xoveletebusuxapu.pdf In PDF document text
    • https://abeess.com/userfiles/file/zimov.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/25573127976.pdfIn PDF document text
    • http://rideco.hu/upload/file/20840813737.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe8d672dd1---5561160295.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/81ef3c346deb09c0fe92919371b096bd/30547464819.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/4f3cb9ec78a3576b6edb70200bc29a03/64493649991.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/90231845451.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/5073436574.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021082914313128631.pdfIn PDF document text
    • https://totounited.com/contents//files/nikavopoxumowunitujuzusuz.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/24179782660.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/32307981709.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/33606482855.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/xugizegizafawux.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/tijuvaludifemi.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14b7d1383b---73039307520.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/12f24d2b5408d70f1f215d1e09a85b81/vowefovusutumaguxapigo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161041251a849f---99570396441.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b896bac334---59037246429.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/r8g220avqug770ui0tb00hrir1/86394232695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=oug+114+pe+2018+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_off0000ad08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD08 13820 bytes
SHA-256: e80358bbe6b4f2b016d0dc5012f86367a0809ce3d09740bb2e456d95354920d8
font_01_sfnt_off0000cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 10488 bytes
SHA-256: be5623517d6f635e68332cd9e025055a82dc8bd7458ed18b2c14342974022b81

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