Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f0da4215436384…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 21:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 21dc5ec6e1dcddc7267fa87704294e3f SHA-1: 8fbbbb68474e57100c65e7d35b7aa4dfa4a694c3 SHA-256: 89f0da4215436384135f488c433f5bb51a9e10bbe45077979469946a6128d963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://visionbrindes.com/admin/fckeditor/userfiles/file/33973267418.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd33a1309f---58179678485.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/sbldnk2lssmcif057oklunoma7/sirevofu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/jobulagegelabasa.pdfIn PDF document text
    • https://auto826.com/uploads/files/14801385418.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/38a84ebc40e6b065bd68199d970c8615/86012827741.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/48858705553.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/20969296900.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/masovazito.pdfIn PDF document text
    • http://parfumkin.ru/files/files/tedewuxuwalabinow.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/qurshs7d6a4121bnd751fspevc/53456117384.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/votaduvuwutadatebut.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/67880131164.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b95d0bb7ccfb44536498a184de8dcef/sanulikamikigizewugira.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/muvoganotuzanereduwirik.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/siitqsks5kvt7jhvomekknqump/50842846906.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/71435083801.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/b4d73bfa21fff9fc99e7d546d9fd32c7/84679104295.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pihtqipp94fa6m0mfbce6g4d61/14891811322.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/83699739850.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/tuzupililevuwenodi.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/jonipaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=skyfat+tannery+company+limitedPDF 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_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 10896 bytes
SHA-256: e3554648de0999c0d3662f327e168598009cd04c0eed29e4577c315887285eac
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 17300 bytes
SHA-256: d3450db2d930c8f8292b6389b4b4e662b1f7b6a47765839ef91131a872a882e6
font_02_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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