Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e424ff792ee052b…

MALICIOUS

PDF

80.5 KB Created: 2021-08-29 15:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dce8faafc890709d21e694a2aab3ff4 SHA-1: 62ce868b2f46a50f822a1e3f066102d6eabd4a3a SHA-256: 8e424ff792ee052b39ff8b5e99c9fa6078a32eaa362ca0949f9c33aa5ddad647
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8bac8dfb---57582808691.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h8b8c8nejq3vi8222srkt3i7o7/45036840983.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c242e11c1f2---vixolilo.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/zazumur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f4c67eb7---98358593727.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/xojesunetuwemokujo.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rakobunetidefaturejiwego.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e854d7bcbc2956fad7fc281219e8162/faxofuxikugobizaxubul.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/37716138366.pdfIn PDF document text
    • http://centronegozi.com/public/rufobuxek.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/ranuzajusutimixukazinuja.pdfIn PDF document text
    • http://dgjst.com/upfile/file/66539398029.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fudotujenepipalosu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077065674424---natidelafapu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/50487004074.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210620_4F8F4FEA7C79AE7C.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/99379941256.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e93370f2---98202128123.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/34652425991.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/zopavetosibanafiwujul.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c60069b29---vakimedelobedexesinugu.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/vifavivewegakoji.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f283a03baaa---51108749504.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/khhr1isbb0ttub6gu34eciade6/81567765467.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/70062636331.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790cbe828b7---78943576327.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xovomevewojarawasasumun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+gas+solution+examplePDF 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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 10680 bytes
SHA-256: 7045388c2de6b00ff47cb64c05aa92d3dc21add09975f3a3f2d8ad2c6df60dc8
font_01_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 17384 bytes
SHA-256: e44c1c4200b0645ce6ea5c01392e12cefe8853251a59094933ce974bf731b5c8