Malicious PDF — malware analysis report

Static analysis result for SHA-256 579f09e15c850305…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 17:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b49e25d31191cb712dd8ac56d8f5021 SHA-1: 1cba9c2d3aec3e943063645c0b6b8f22b0560ce1 SHA-256: 579f09e15c8503052adf029f12b9ee7eb3d5b24c8ca36d2e8f4edaa4ed8f9716
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 identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://coumert.com/images/file/75909914243.pdf In PDF document text
    • http://dgxzz.com/uploadfile/file/72786930086.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/54787375797.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f27425d3b---vemafimudida.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/66962822560.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/48138109973.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/73973879331.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fasozezetuwanurujalotutij.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef57980ea3---bijabamojatupobogif.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210907075025.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/fuwavoxulotawapijime.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jodimudupusirodaviwubul.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nibal.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/sesexipeximewebo.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/80814413829.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d2a06bfa---14415765161.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/lanilanun.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/56548088578.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342bd309bc7---52851888907.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/36208343446.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/49303275024.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/f5deled06k7hf459meatlmqsa2/21505331567.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/bawirojumu.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/surubifadowojixiwimakev.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dogizu.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/vunufamesazajukosiditoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=industrial+fans+and+blowers+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_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 10768 bytes
SHA-256: 016d405b2d7cf5af736fe540467780bdb42d799c33c3be581fec86cae8f3f93b
font_01_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16708 bytes
SHA-256: d09f8cc96a6dcccc0cb3fe67be5151831204c230107cacdced5754dacceb01a0
font_02_sfnt_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1