Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e3bd1ef5f95ca7…

MALICIOUS

PDF

83.9 KB Created: 2021-07-18 18:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d3edbb448f9c140af5a16f1ffca03f7 SHA-1: 87af309087e8ad8373321fac08f7b3417ce56313 SHA-256: e1e3bd1ef5f95ca7f8a761e322d4cf650b81c488f97c0453578aee161a9daf89
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sivam.pl/files/file/18349116442.pdf In PDF document text
    • http://andlupa.com/userfiles/file/7391476140.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/sujejewe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0749f3de9---77642510712.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/leromokux.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9ee6ca54f703658ebb3dd845bb6e4584/setiriwolowozexatasitomed.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a40c8e87056c25df63443284d588a4c/10958128067.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f1ff8c0db41e99945a673a311df37bfe/20059745196.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/luzuvasopilemizetabasivo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d873b34975022428d61369f1cd565603/41136220153.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/29936187317.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8af944843---pemoparik.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/33207863492.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/jomobaxexakibi.pdfIn PDF document text
    • http://parentini.it/userfiles/files/rixigoxapirifotovonago.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/xemaxidivusaga.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/19333849395.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/92328b8123dbe0a2e475755a2ac73045/70502459242.pdfIn PDF document text
    • http://hydrem.ru/images/file/sejawabowagipijamupaj.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160818d9a6b34f---63854595982.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/wolowuvumexo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fbe35b105e---28698733220.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/faea0981da24e16bffc64cc5e20f98b1/vupad.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b4159a90f3b008744ffaf7046d84ad02/bufijemulupugoputum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pinworms+in+adults+signsPDF 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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16388 bytes
SHA-256: 3988b2abb34d4409b11a8d0323455e8731265c086b20afb036cb1084792ea991
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 10648 bytes
SHA-256: 225bb5154a55183952e54cfd44de2403279a9b7d3ff47eef4eff91f531422959

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