Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e30c85babdc6fed…

MALICIOUS

PDF

88.2 KB Created: 2021-07-13 11:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 77e27543de03fdb0d624fdbb79c97181 SHA-1: 17368475ee420b02157304b470798e00a3c09b3c SHA-256: 8e30c85babdc6fed2cd7e407460d0062ae05b6a0553822fc2ebfa5cf33d3637d
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious content. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic and the presence of a link impersonating Facebook strongly suggest a credential phishing attempt. While no scripts were directly extracted, the PDF structure and heuristic firings point towards exploitation and potential download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=simple+science+quiz+questions+and+answers.
  • 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://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607664fbd022c---gidujo.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0618edc36dcbf237494bb26dddfc94b7/75862408473.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776cb9c7b4d---kipuvuponegi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a41efeba4e1---zegemifolixaluwu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/aueo0aft5044cltvfol36jo5p2/96529415972.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///46990357691.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/96979762929.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ce0c438635fc73fe632f97dd5270323f/kivatevakoz.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/94557723934.pdfIn PDF document text
    • http://bibonatura.hu/ckfinder/userfiles/files/94356483761.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4e8e69da---74830497973.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c312327e---63104816631.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/90802216990.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/kaxapurub.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/rudatifapuwuvukutenoj.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/jevixutefax.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/98464482993.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/10410586282.pdfIn PDF document text
    • http://elm3rad.com/file/23395784646.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095f20c5a9---28245798539.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/84431755511.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9vg5d8n2rq33ko6acmoo7hgbtd/keluxexonomuwenopak.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ea34aba2da3b6b4c953ac1d8c421b780/wudobufim.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/dijeselizuvajufolibubog.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/jupudoj.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d83f6b65465---25659412251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=simple+science+quiz+questions+and+answersPDF 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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 17216 bytes
SHA-256: ba46d22471d8860df4669c5ec4ac6833fafae62164e7affe0add4e6ea38a31c1
font_01_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 11144 bytes
SHA-256: 3aedd6ad2d32577f9aa0109cebd16786c5c05c896201ccc770b1b7e988ae8eff

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