Malicious PDF — malware analysis report

Static analysis result for SHA-256 8561d3d7674305a7…

MALICIOUS

PDF

92.5 KB Created: 2021-09-03 20:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c05a9e664b83d21273516df2ef3269b SHA-1: 04f2c0010a73930a601c898a41ac26a3d5decea4 SHA-256: 8561d3d7674305a7a16e37248eef63bc9b5ba30ce5883158f263b18ef5b96399
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607273f6f38f0---2777394868.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6db70dd6b4---45515988219.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kifinegutusil.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3656d97963---84323559905.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/82264817059.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/80298006076.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/69455862943.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/zijiwefimaravanapunu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/rolerexedosadinemalo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vh3koarj4ie1lr5j48hq3acjh0/jotugofiwotepato.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160784dfb9727a---83964128374.pdfIn PDF document text
    • http://theurbanthinktank.com/files/zawetapake.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/86046992987.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/madojarapubut.pdfIn PDF document text
    • https://gangnampools.com/contents//files/sidejesamamufomo.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/kemubadus.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607299a49d989---niwaduxubideri.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db4924df4---mikegifijazagujikikiw.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/pukajisagig.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26be82365---sozizuwapofesebuxo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210606183245_t464vm.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/rebijiwe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a0432c6a---54749253339.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210829_1E8C19FF1A730A66.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5k4ta2tvrlgs25l56n5emjnok1/13674662828.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/42fc3b07c49cf5946a4f7d6dd1cced4a/xulubusoxu.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/kunixexulemiwififute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=miguel+angel+asturias+pdfPDF 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_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 19148 bytes
SHA-256: 4f151d8c3e7eacca4fc2b273ea16efe22c137397ee6494bb14ebe1b0a358076b
font_01_sfnt_off000131fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 10648 bytes
SHA-256: fd351876bc032bc2d49d202207e957b1a60a1e2955e091649c7ff28125124e73
font_02_sfnt_off00014a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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