Malicious PDF — malware analysis report

Static analysis result for SHA-256 627a68450b7cec4f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 13:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 217bd1b394695d24779cb452babf57aa SHA-1: de595f9682c11ee0229d81f956993d482cf0e417 SHA-256: 627a68450b7cec4f88aa4b52b41e36dcad27371a2f527108706073e0103dea76
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ping-property.com/user_img/files/desaduvezefu.pdf In PDF document text
    • http://travellerisland.com/files/55053045464.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/fixugekevotagegodobeb.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/17280469203.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/gogisodadakimi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5dce876e---pibabofotipulapugalige.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531fb4534---tomukifa.pdfIn PDF document text
    • http://eva.am/files/51e96577d182c36e.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/53214532190.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tuvabiwur.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/82212274818.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b80c8c2c4---rukafal.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/29794034926.pdfIn PDF document text
    • https://capecoralliving.com/media/file/vufokowokaw.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/70689151439.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/17240835396.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/47278794657.pdfIn PDF document text
    • http://lovesenergy.nl/file/wokunuvigufurirawivop.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/fotifirovip.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/25133598191.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/veditagufevidopudido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=custom+icons+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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 17392 bytes
SHA-256: 0b810f955e235a51d6d40e6acf2679c892020c6371dcd3a397cf4a1caec5ef24
font_01_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 10484 bytes
SHA-256: a7541526dec7c81d1713d7da9d829b34812e9dfe62c295b09e780e2a19517ab8

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