Malicious PDF — malware analysis report

Static analysis result for SHA-256 493860b9d76a117e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 02:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fab434cb0ddaabefbad352c7060f499 SHA-1: fd2a8f82ae8903a8f0e0dff80051839229685a11 SHA-256: 493860b9d76a117e75901290f9d8b707fac27f9358769507aa2a9f868c8491c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the presence of multiple external links suggests an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ogcdc.org/uploads/ck_upload/files/70162454737.pdf In PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ceec7b535cb991ef9b62ce940c167310/31943802434.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tajezonozaguz.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/wopunadejojanuwidine.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608058f0ae362---boparagapube.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8461d98084---45677034639.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/tusutomizivesamare.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/vawomewu.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/12849349386.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/77bbdc7acdd1459a720d83b281093a4e/15566224168.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rumiliwejit.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70629c760a---1507131514.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c0fca794e---54031953599.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/61542395362.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bj2v0gacsp8j8nllk138mn0l07/76667946546.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/viwupotidepejesufugotav.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xodasamatuvilafelolegelu.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/jajipinoga.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf927772f---85642852842.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-30/20210530044400143397.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/902f87535dc18490481596fa52d14028/11385337067.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/refegexen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=house+rent+allowance+letter+format+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_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 16948 bytes
SHA-256: 9c32e8d9db78732e8039c4e4e860a09740afecf4823869328076c7c2fdd26532
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10868 bytes
SHA-256: 755726b0d715e061ba692139fa2b7c9006ac1bb2d8b9b5154df98a0881b12b0e
font_02_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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