Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5fdb63ddf86bc1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 00:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f2f8d4602607e75d665abe2c95faad1 SHA-1: f6374f599f15fef92293e0e391d2bec8375082dd SHA-256: 9a5fdb63ddf86bc110665483d42fef94fe2417b92e9e8ccd2752404a5d9286bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cabsfromheathrow.com/userfiles/file/didomerake.pdf In PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ae6583bd---vakixopapiwowidabigabimeb.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/82608015189.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2op3pqojuhectqttnqkclitrut/53090964925.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/e1bmrrn3iif8dg795r2hcsi9p5/pijakoluxevetotuwetafafan.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/6d4cd9d8c1593dae43e54dbc57df85aa/xumenovowigilejewinaji.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/40603103121.pdfIn PDF document text
    • http://homeopathyhk.com/files/86809026080.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445df2a3d1---85056270265.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rjocnf8jkfvsekm2fnsio9pcgl/51475357551.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/19329222530.pdfIn PDF document text
    • http://ruihuitax.com/files/file/16236474397.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160778a2fc8d2a---2820927707.pdfIn PDF document text
    • https://interconformity.ro/images/file/41462621305.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3b68b5b8940b9bdc7d546b4b66414d8/5973056115.pdfIn PDF document text
    • http://abpaluso.com/upload/file/24094128403.pdfIn PDF document text
    • http://teakdeck.pl/files/file/xofawozadepep.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/76946397258.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/rigimosox.pdfIn PDF document text
    • http://canadanur.com/resimler/files/81841973417.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/woredupasuguv.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/luluponaxidapirawimexesok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=deforestacion+en+mexico+2019+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 11300 bytes
SHA-256: a4b8b101e605baee50bbd3f3125ca4754e469a146be893f908d59ac7b4dcb6da
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 18416 bytes
SHA-256: 7498872671e843aec4edfc5f57b6468c33ddd11e56e9f0bd11e0b54540bf18ad

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