Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ea0eee5ef7ad9e…

MALICIOUS

PDF

92.0 KB Created: 2021-08-15 22:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fef5a49b58402697dc2320d8c5361b44 SHA-1: 53750c834c8f3f0e2f3437db43b25d7ba3c2f68c SHA-256: d1ea0eee5ef7ad9ec9dd3f86fa7015efbd5004a36bcb6872587456a92d3e189b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/uplcv?utm_term=miss+universe+philippines+winners+question+and+answer PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6da006485aa758bce33f50a9c33fb298/81924708859.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/fisegabalale.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/42230850250.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/03edvsbrjgqo0alsn2c9unmc5d/34992452908.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a4887bf20---duxafatoludotororimujax.pdfIn PDF document text
    • http://chapelguild.com/images/usr/19900955725.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/tojezib.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb432d2d554---23137088887.pdfIn PDF document text
    • http://envigest.cz/upload/file/manibirelivalilomanoti.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16106234e2dcb4---ganexejinureninoziz.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/29228787211.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/23339086939.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9ff10927b---81815518317.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/s37dgcfn9t3lfup6e7a0bfsoi5/39080614511.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/galorimatirulezazegijamip.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d11e86877---12095346576.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///72647500019.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f40951a46d5---togezikazevatawomovokun.pdfIn PDF document text
    • http://hanauhrova.cz/files/81201247210.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/74880714773.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609432ec62b2f---bugefarepojidom.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/efc36e2ef09012ab9968933bd25caa1d/40062041619.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/webegiwik.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_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10880 bytes
SHA-256: a66d0fa83ad16888e05ddb3413cb2ceccdd4781773c63d530010f07e069895b0
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 18056 bytes
SHA-256: 39fd005d60b88fd37db7aa792f146136ac7397bbe1c6ea61b5bba16f3ba96b64
font_02_sfnt_off00014985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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