Malicious PDF — malware analysis report

Static analysis result for SHA-256 495aa81e3a55cac9…

MALICIOUS

PDF

119.5 KB Created: 2021-07-13 18:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdde5ef101378e63f76e17a330bc4bdd SHA-1: 6a53df59da6ae75555cc38d3acfd5103d1b395f9 SHA-256: 495aa81e3a55cac928586903f1435863d5b2bdb14714d805ae460f703550eaef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the PDF structure strongly indicate a phishing or malware distribution attempt.

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 http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasawigitojufufise.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160874301a9bec---23218383909.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/nixibusabodugagodajunipot.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/65117117554.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/jeridunuwaruwuzilexe.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nojafidefeke.pdfIn PDF document text
    • https://ebooksweb.net/files/file/29694380780.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cec2d8dd2---botisegiwurevexawoxonat.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/19e58ec0bc95cc7ae8ccb452882044e1/91676327399.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/83ff60a1ed844ed94825a67e9ccfde18/gibibukisunesolipimilu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/022b0343f29589dd2741dbc2db9665a7/28878101726.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0bf0afdcd985e7febbf9a4c890c57289/vopud.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afeda005b6---nelananezejukatetodo.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/37933561436.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/25856907221.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3946aa0e---finelimotigolofixewose.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/kitesod.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/82ee4efa84d6c1ed4b370f9118f89efa/majilobefomewegewojoratu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a333ee9ff88---fajologikobilevilofokiz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f6e46a801---denimepojuvalusajeruvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=astrology+in+vedas+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_off00016aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA4 21152 bytes
SHA-256: f8e85930396d0b28cea38cd505fea6528445415515e10de687f8d4217e4ab47e
font_01_sfnt_off00019ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6BE 10836 bytes
SHA-256: 14bedaa5eb03511a31103edfca589266f1e33b4e136b831c87e757f6ddee865d

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