Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c5c40a045fd196…

MALICIOUS

PDF

178.5 KB Created: 2021-07-31 19:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c10d2fc81cd5814ad481bfbcf4260fe6 SHA-1: 2499ff9912d36b63991e96a7336ea219c75dbbce SHA-256: 41c5c40a045fd1967bca06f3518297979740e798763a10211c59c6c448de8524
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics as a phishing lure impersonating Microsoft, urging immediate action to prevent account termination. It contains a link farm pointing to compromised WordPress uploads and other unknown domains, suggesting an attempt to redirect users to malicious sites for credential harvesting. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tales+of+arise+system+requirements+reddit.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/r499fh2146t3jo6srke8iktl13/benakisep.pdf In PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/rupisekamaposinuve.pdfIn PDF document text
    • https://webmenuplus.com/images/file/vefalonikonafizurod.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e176829ad17f8b24741d1e43a25cb572/pebisazuvinib.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/65c5a3dd1b27404f3a304870cf8e6b3b/11641771929.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/33951444128.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806b905333d---63548663198.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/sobavopugetufamofimus.pdfIn PDF document text
    • https://parfumzone.ro/files/file/5639937216.pdfIn PDF document text
    • https://lecapsuledigian.it/file/8854072043.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/57491070961.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/43714284082.pdfIn PDF document text
    • https://ibextrail.com/editor-images/70606593260.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fb25caa5---jefodolenur.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/23225089938.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbc83751c8f2074f1ab0a958819fe0d4/mimebabuj.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/72639776343.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/wosasatupemijop.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/jejelaxidagafagerolusapi.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45eda988c8---91221602391.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/xakejuw.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/99719657981.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/71908342311.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ff5625e0e7935ba066a72f02934aaaa6/50532523608.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/57205505758.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/61c7d38a98cf9bab697fa8b9349bc0b2/85188719296.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce39678198---67930881203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tales+of+arise+system+requirements+redditPDF 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_off000255d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255D7 20252 bytes
SHA-256: 6071ec6ce3c1712264cf2eee9a68f069770cde4347035fbbac3388bdd2356c8b
font_01_sfnt_off000288bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x288BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002a0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A0D4 10840 bytes
SHA-256: b69679765e4637636a14d63a951f7e780f7657392fbd962215d9b7cf44c5f02e