Malicious PDF — malware analysis report

Static analysis result for SHA-256 762c65e1ea08f346…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 09:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cba74a8f9425688ea0502b2eaffad1df SHA-1: 60e0a0b104f3cd83345caac743944a80b5e7a81c SHA-256: 762c65e1ea08f346a76b7ef4e1ad20b07b8fd27fddbeb6a4f154d2b8ca288c6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=what+are+questions+that+have+no+answer PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a505a3b3ade---59836232944.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1d5467a037cb634e892f5a31d98f0c77/japumuwomatat.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cc4a4a9bce78fdd02cdc038ad546c9d8/tidabakufoxaka.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/999e48aa4afcd49767a079d03ba15375/jedudisoxijupijawamapise.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/59111280537.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2ad50f94bd270af806e4aafc3c5fb33d/kejilebitapazuwikow.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b103b3ef8f7---jivubadunirezinumisotet.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/909438dcdce956ac3e78b7848d6f395b/89140192460.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0e1469ec0e0ad108711408a9d5b356be/71936430910.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/77527407166.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/47146099671.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c72ed3f4168---43142314213.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609421e540ba4---7679247622.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e166bfecb---nagujajolekizisa.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/2db34b2f6570abf56fba3940c541cc08/vimet.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c91d32507c60f2d95906fcda8df692a0/ferutazirutudufukebinozi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2328c005e---zifopubozeronumajafipeti.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e825a0324---71494477802.pdfIn PDF document text
    • http://alkanboya.com/files/file///ludikakexakisokeni.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa047615a7d---1124181445.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qkq5ai1o1tdau1t5q2rrf7iu92/14655858794.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/1cdc9f308100cded765be8a092c65243/pinesuraximupilakunabes.pdfIn PDF document text
    • http://sdds.be/userfiles/file/21568086575.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/siresobakuv.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0ce34e831eaa48b1703de184cf2f8287/bovezivazivo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d5f40b245---nezetegajome.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_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 10552 bytes
SHA-256: 42d7998688581673ceea88441a77e5ef37b97836db568512691f74aac2fa79c2
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 17288 bytes
SHA-256: 7f4c9d682ac618e6694edba01f6559195fa8b4b602cc15d9c22e057dbb9dcd52

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