Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1e475b8c588e09…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 15:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa23ad54a35124259ad596343607e29f SHA-1: f1aad6d25d5fc1bc691968035ee98717f77a01a8 SHA-256: da1e475b8c588e092ef57758437de3a929f269630c8e975f809853f1a86b682a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d178dc712061e65f2c9a03a476d23873/45484281298.pdf In PDF document text
    • https://wendi101.com/userfiles/file/fomasekedu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c78d3c25848d24516c6335c972b938ce/10192508146.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8bb61340---tewiwakikefideziguwigiru.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcba5b506---fepeda.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/32832495037.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/95235661242.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/19829293504.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a580dae2c1---79339421397.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/39921153239.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1cce1ad3385fdc43f5ce9cc810601227/vufekenepatonorebog.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/nuxufulu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/11953187846.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1978d050652379e626e65f756029cce6/solalajilobuvejorikoder.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3691f1ab22bbf5487c96990021a2ab9e/wuxujuzazazedegivas.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/7334762968.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e02009635d43a296fd46761aeade3669/86504799629.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/geremata.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/59660955764.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/g8iipv46le7v5mf841a5vh2nsj/busalivebu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/68025890672.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/67512810527.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160720a45e66e2---xegowolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=reading+comprehension+exercises+for+upper+intermediate+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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 18704 bytes
SHA-256: 72d1ee081c59a1117cb888c9fa65f4940993e0e77cc81544b9b710f2e10b0dab
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 11268 bytes
SHA-256: f4297e6d386021a0a1f3b4c71ab8cc82f6f4f618a52bd669998ef8df089e6bbd
font_02_sfnt_off00011bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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