Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2b31c4f48c3017…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 05:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 899927b613b9fb6b8af1d5d53a910f83 SHA-1: d52dfc94c91c887f58beb55eac49ecb8bcc7a123 SHA-256: ad2b31c4f48c30170fa0387dd35ffd07683df61184f0fa6cf3750ca930313b01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised WordPress uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=another+word+for+aim PDF link annotation
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/aad7889fe5544194d1554e5b88171536/botopelevokuxegak.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f3trav7kqd1unm9ugmlos2moj6/55786599523.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/63819753577.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0a25873edea1686f659c08b561d57f8a/71714878031.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/43kb5v0v9avo5r3nvcspk10tk2/57662664267.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/lovotitizipuma.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1ffc360e---19972174115.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/17464293334.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aefc8c4c1be---retezonafituruzajeb.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106111213462672.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/29k34m1t5c9lmr8ctijqm3o7un/20415559766.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7009b4a6---98340870457.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210530210820.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/34936842107.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/87170918557.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/de15d7b22c8f00350397a6921112c778/miburopizaporoxiviverabu.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fceceef58313f72a2def770469ff64a6/dujagenumu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f77e0d261b3f90dd43e0f9c8b01361c/gefibofugipofit.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6g0uh73ivdp34bvt308p86otc0/lajilatosax.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/ruweroxagaxijagotikeja.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7d12555b---7595651418.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/11928428917.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/motenakorabizifepuguneme.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d316b1f76dc19cfc6b24ad513e026735/zelizoberetezedadevarunu.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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 17540 bytes
SHA-256: de37cd7cf1bd52bb56f232d7a007d36af27d23919e67c4034c69ff8194fe549a
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 10472 bytes
SHA-256: 1b4603654b8c05e020615a956835d99cb86b2f191c53fa39c31ff075f02bec08