Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d3b13bf4841f37…

MALICIOUS

PDF

76.4 KB Created: 2021-07-15 13:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 71677607743235a72aff41b5175b1697 SHA-1: e08c4a8a8ac6c5f4d20d4510f0a33f87a22cb594 SHA-256: 27d3b13bf4841f37fe130d0f07ac786ff6210696ac07a7721d480fe3e7e539d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://solidpractise.com/files/userfiles/file/kawixalubibevik.pdf In PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/surosogisikefap.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/nurizinegawizufemaliweweg.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/14314644055.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7aed48705---fiwufilife.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/miselomuwe.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210617_7a5d2.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfb22c2c8---negumumirutegurawepase.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/38724038788.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/81027243704.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/93198829552.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45ecec9eb---4263278512.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4616efa2e---xebok.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/82345071240.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cf97a6e7a815dcf9c192d64f4e066498/gerunawufuteduneneme.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac9be1b66---57683054905.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/70758870632.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ff362b11---jovowomuzibapiropogolu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b228d47bb---96504901244.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210708015912_h47ua6.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bl16693umnrm9kkek2q7svdfgp/26948307420.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a579a3cc6---19242791021.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/gugepuripudofogunatopazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=induction+of+labor+icd+10PDF 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_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 10532 bytes
SHA-256: e00de70ec77a41b0e3847238dbd0919d11ccb5be2c5bf5e9a005fe041d031c12
font_01_sfnt_off0000e133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 16644 bytes
SHA-256: 83f2c573fc9c364e182b1da94232df06b3139b5374ae7bfd9dcc4f7111319ff6
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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