Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbf34b885686385…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 19:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 85b48fa75f653bc454567bc2bfad0124 SHA-1: 1d8f7e395552feb96cd82261ee741bf749b56eb1 SHA-256: 9bbf34b885686385d4afa2cc04344d937ec5efd75bfc3d0b7ad09db6b56c1c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised or disposable hosting, indicative of a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bded85e6c66---fejirumibe.pdf In PDF document text
    • https://tramtron.vn/uploads/files/files/14656298014.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/10228453150.pdfIn PDF document text
    • https://wineart.online/userfiles/file/73680245263.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3603affa0c121f8d8c9f42f37f7cc1be/917521511.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a13b8a624---xegam.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/mumuwiboporuroxejerilos.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/tumuwidazaguposuremezebub.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/komoxazovojepemo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abba0c25463---93034343078.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/8973160802.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jiviwasojudomuju.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f364e9b0dc---45118458592.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/359b6cb144d591a7cb865f09e5bcaa92/17966978450.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25ffc348c---todutavozasusakutusob.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146698d599---rumadut.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tuuc039auj7999mg9d4eqsakf3/bepuxejesazamugovuvume.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe17a9323e---vufadus.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0c2d1826---5263565787.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e79874f7---xerudogemovusideliriz.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/28673056639.pdfIn PDF document text
    • https://fultoys.com/userfiles/moxana.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/tigulujexekerarawepizekaz.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867bebb6e5---38199406723.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b866444ed---sogopaxebuzaniroruw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=atlas+of+amputations+and+limb+deficiencies+4th+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 11084 bytes
SHA-256: c049de06cf3722defafc5061b2975458bf9e66775fc39c0f18bae5051e10cbee
font_01_sfnt_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 16672 bytes
SHA-256: 7331f4c55850b4ad8d691822db441f9cf231c2561b2952a84858374b5bde294f
font_02_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 4500 bytes
SHA-256: 853c5283859e02bbe69c7c23cd5e0647c6722076e41c0170e2f2e32202f00f6b
font_03_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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