Malicious PDF — malware analysis report

Static analysis result for SHA-256 348844be1d324440…

MALICIOUS

PDF

87.0 KB Created: 2021-07-16 17:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 025ae9692ab7d6d78fb631be71e1a6c6 SHA-1: ea30a1ded070cca3975227024f2e34eed93a23e9 SHA-256: 348844be1d324440607046f55f6c2e1002585bbb1bc307606b071226e9bd0f02
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of these links and the nature of the hosting indicate a likely attempt to lure users to external malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd83534d199---firidolosubakokalezo.pdf In PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/dunidekedilukowumenaxerak.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/46837206190.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/078ff51a46aebec85a0939e1d693e12c/60593675682.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8cfb580c---farawe.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/buzarap.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a777897135f---88648678891.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3ec372f4---bagejekemifexavewage.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2p4ci8mejj7rcq6mt7lm0gdua2/rukelimiza.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b393f900da5---gemenalapopasugawex.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/84677935537.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/15024063883.pdfIn PDF document text
    • http://dnepropress.net/files/file/noresetamujufosax.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vjttf85heuh0n9if40mb75m9bi/pomerisezipeb.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9603ae68f4da1d53eeff8f4a6696746/laxorokinibugobego.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bubaxuxobomemobegiduneg.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/kojotesimiked.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/40557656677.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zopirejovib.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/krdggucb2sc0o5hnf24eqoo3d0/jazinixemijopeforagalawun.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/96797868849.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/pemufedodoxogaromedono.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/111686851.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/bomenomawiv.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/negijazewipawiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dew+point+70+degreesPDF 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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10620 bytes
SHA-256: 378f2c016ff6bd12ed6e972ee4d21555255c01b84eb0e5fc9e6af50cbe19e5bd
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 17716 bytes
SHA-256: bbe881810353575a62379983e4521c36e656fa3f8699b8b0953f9f6cf9cc8820