Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb311857ba1aefd2…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 05:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3429a6403c104251d6710c65bc0dd848 SHA-1: 394252497bb348d2c5912e5e354a4c4af3c058d3 SHA-256: eb311857ba1aefd2dddb0e0fd8183f24dffc437b73be9b0d2a2cb5ed4e4b96cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly imply an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=the+ophthalmic+assistant+10th+edition+pdf+free PDF link annotation
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b5473d6ef858ec3e83e8ed467192cedc/mokapebusewozuwade.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fifudefoz.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f21e9cc6---37341755570.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jegunavosutulatuf.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/90832692757.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/fisagarigadulo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071acf941155---baletavuxepu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/meperokagutokojeweguve.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/xilosikiwoduzap.pdfIn PDF document text
    • https://activepymes.com/pub/file/11019902044.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/81008752909.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cd5f4ccb9---10388470108.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/pojujofanilote.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d829ce587462f02c7837dba05ab1f8f3/69448881431.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cced5d2cb5a---57462988206.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/litaj.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gulavibefereki.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/52114801036.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/20fc8766e390fb25042227e74d879eed/ditugamojerowomatiwuwe.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q42ih0amp4hkpvk6d1nbfagr24/wexigalazi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/99ef07ddd293e9192e52c9e3c942d521/dezolol.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o75v31hqt3iaaunn5i3dha6vp4/kadewojemuvajareruf.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_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 11024 bytes
SHA-256: b728759929c8dffcf526af38517ae939f461e7cbacbabfe96a61ecd46271c90f
font_02_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16984 bytes
SHA-256: 5268b01a45c041c0d4feea1694b81463628bb5aa7c240c15e906488202b39764

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