Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb8abfdfb8cbd69…

MALICIOUS

PDF

78.5 KB Created: 2021-08-01 19:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2cb08606df8ac36e78a2da9f7734a66a SHA-1: 4ed1888665b97e33473f1266b7987a03c582f750 SHA-256: aeb8abfdfb8cbd69e3c70f3a740674baf5eb8232e7a047f30fc0d23dc88474e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious websites. The presence of embedded URLs and the nature of the links indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=amor+divina+locura+pdf+descargar PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fc5e6d6f7a70b4bb95b0a2e65b2b83dc/vajaxoduxisipuxi.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/7331584490.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/o1dsc23v57uaaa4vnled5v0ha2/tilevumesokub.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/fuvurebozuremudewosuda.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fv0c42isclf89c7m524lhfpn3/tifen.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/pilajadusubu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9db2a2d3a---12134720897.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da12a12c37bf441575998fa066006417/gagoraribix.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cca5e3bf2caa8c10baa582186a0cba42/gexarojugafo.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/majetirewofinamo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b8451f981---44260704405.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/40c317ef44571c6ab06cddb2387db0c6/52134399220.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/nepukixop.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3463d4360---5139420467.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7cf703f93b558c8dd8c12bf3f4691384/tujirotenix.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/busefel.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/68652769473.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/ruxixujizukijuro.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e1941e24f3dcb48ef50c0f53e95482df/pizutuxuku.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/zotapu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/754b43ps62l71evji55d8s4ekr/jifidivududuzajominazekim.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0905b507---dejegojelojixopesex.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_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 11012 bytes
SHA-256: 0eb07a6a6b7b4b3908f03ddfcddbafa76e7e1abc9cc146be3feb179985357132
font_02_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 17116 bytes
SHA-256: 2b661ec231187d04f4bc7aa080df397711fe4f9127a81a177deb842be75ccf0b

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