Malicious PDF — malware analysis report

Static analysis result for SHA-256 256516861a6a596b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-15 23:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9b8082689770f25827fa96a3f076389 SHA-1: 1863a04f584112751fe8784a3cf3a0b5745d4547 SHA-256: 256516861a6a596b4c0fde17b6ef015ba053d91f5379edfa2bf720ad8d0d1913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=husker+wallpaper+android PDF link annotation
    • https://giltmorestukko.hu/ckfinder/userfiles/files/sotugivupagud.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/fitenomopovamas.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/fuxinepexavubutulamufu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/33742612332.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/04/gitarevek.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/xosoriwilidofejad.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1e73o6jm3ojd8ld7t1ad7808s0/66474167322.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/dikananisasifedawofekar.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/zitenegakebumumaw.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109140733245866.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/sikemixawedusomowab.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/22785817146.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51ecf3b60---watore.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394229a240d---67714712106.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/59589294800.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/piwinukalamonanimi.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/besabokajapizadaligobu.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/45017135084.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/1471700955.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/29377608878.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/natoremasasirerubepege.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/fitiwixavaxukedijotamekov.pdfIn PDF document text
    • https://gencatakan.com/upload/file/93888695687.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/11584821823.pdfIn PDF document text
    • http://vo23.ru/upload/file/suduwakum.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_off0000c203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC203 10556 bytes
SHA-256: 20ebe4598ee580c2da22206fcbc34ba0cfe2fd779c26e4d22cc48df22abce3ab
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16644 bytes
SHA-256: f492ae73d559e7dcd54fc058cd1bc61097533a4ac2957bd303cf9835d482cfd0

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