Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50942119c4f388a…

MALICIOUS

PDF

85.7 KB Created: 2021-07-04 19:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4063b4dfe1b7fc69920142d54e826f81 SHA-1: ac30c6c2d4a38f63f1d0254f69b283a41787c099 SHA-256: b50942119c4f388a12749c867b75a95733452f4a04f0bb4b110d512462c66084
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allycatering.com/userfiles/waniv.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c943c3b13a00fa10592f49b902e35d5f/repovaloz.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4ac2469fc---10146738994.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/n06ogsvicbg8vg8krrda1d09ig/35383888782.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/981e0584907c751b91997b3bb8ac7c2e/5688351245.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/88428785744.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pm8cac1voi8dfta2eqb3ptdpl6/30876775379.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/36297794335.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/fatufa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa40001ff---33791324807.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/diget.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/zifalixekupefavop.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/familolowowuwi.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/vodosomubew.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/991c078de1a0d3673fd9fd73603cd46a/pidux.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/npa1i6fo3pm3l3073qm3i98cv4/mumejovamalobepewutif.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59187673728.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0f8916af---78428527136.pdfIn PDF document text
    • http://brukbet.com/user_images/file/65777641933.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae4eead042---loxip.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/61705859511.pdfIn PDF document text
    • https://migger.dk/userimages/file/22665691752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=spooky+little+girl+like+you+chordsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 10908 bytes
SHA-256: c81930545690fb03b4758c955d89f93934f8be39110a99e91517e12ff0f5a4fd
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 18228 bytes
SHA-256: 8174dcc4063145e851db31c11d1f32c5f0c287f5b569106abf8247ad6696a94e

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