Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e15779dbe75617…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 22:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b56cb2161ed7444970147c0b5d4d3b28 SHA-1: 462eaef7c5044d4aab6ad9ef28e61367800ccc6c SHA-256: e8e15779dbe75617b1adb63775253e7b77284fbb59cf425d5864be56fcf39a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or redirection scheme. The document body is unreadable, but the heuristics indicate a malicious intent to direct users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609787ed8ca41---61262581685.pdf In PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/51771414139.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/bamawuzolevolapo.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/dinevibupuw.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/mofogidep.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e97beb29c44---xobuweresokan.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3t05g3ib6spct71t2irqdqvkqo/midotikeki.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/3525726540.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/18615920267.pdfIn PDF document text
    • http://charontrade.hu/data/file/16407394023.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be680a46d---65079791778.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/94bcd25c19221ef847667a85612b6c95/83818825259.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/muzavof.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/35895370896.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792ee93dfa8---7051940857.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7959d347---56265951454.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d78385f049c677468d4e0c86bff058c5/zedimatoruza.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3v4l42n94n2vmgeho52n3jg0q9/75336861731.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909473b9ec0---kowamewumumikasazefumu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3ovm6h6atf4g9qd63tdk5l4fuk/punebunazekes.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/81431132792.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/ramevofimabinulusu.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kegejudoki.pdfIn PDF document text
    • http://premium-h.info/files/files/40859325272.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/70741872061.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/65264138190.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f7c233a8c---wafuzamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=changing+improper+fractions+into+mixed+numbers+worksheetPDF 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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 11572 bytes
SHA-256: eacc862e71342c359d932929687893e0c8f86bdfa7418e41e7e668e586199978
font_02_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 14688 bytes
SHA-256: d8498a5740df0b5ce3f256430e1e0d0a13c47617b4c6d71cef42eba1d84226e2

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