Malicious PDF — malware analysis report

Static analysis result for SHA-256 b072754cc01b953d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 13:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0143eddfe0dc2e62368409a22865ec8e SHA-1: 72915e61f569c1df75c96acf6910d01b78e8c5d6 SHA-256: b072754cc01b953d91470f7a49e976f33f293d9c8160f6f39fa020baaafba040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=como+transferir+contatos+do+iphone+para+android+via+bluetooth PDF link annotation
    • https://hotelharmika.com/assets/userfiles/files/pivim.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/nedifowivasujakezuviv.pdfIn PDF document text
    • https://value.ae/userfiles/file/71421042964.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xekujesuditof.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/94467337039.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/pamefesugosugijaxubi.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/27718545097.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iugsdcb9b9gug8atgl76fd82cn/60133178898.pdfIn PDF document text
    • http://vuason.vn/upload/files/faxumoragibag.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/wowob.pdfIn PDF document text
    • https://znalac.com/userfiles/file/xalipajosorinuzovutuju.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613681dfacba4---2783085747.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/bufapozivufunonozij.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujor.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/3082637901.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/42397488836.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/turuzalejebuzeb.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/79385871496.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_843433E7A9A1D436.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ae6842be2a7f1e5bcf97447da07a946b/52796536145.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/setot.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/26325066661.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dudotawogesepifuxusemila.pdfIn PDF document text
    • 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_off0000dad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 11220 bytes
SHA-256: b276bf8b1c0b939a67e8647328d9b029315bd46828a080e003a34c23b935f6ab
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 18836 bytes
SHA-256: cbfc881fc60dc524bce8d9b95c27fae7b2d3aea2bff9d62d354ea93010d45ed2
font_02_sfnt_off000125e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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