Malicious PDF — malware analysis report

Static analysis result for SHA-256 00130322a8ae8173…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 17:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51c8caa6557f55c522aaf803e3348539 SHA-1: c7493c154775534f5c218a7867a6da4f2045a734 SHA-256: 00130322a8ae81734b95b3fbc104f31d01ca4b0d7d803eb5f44abd12c091efad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://lrsdev.com/userfiles/file/3027303090.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/bavoxafifa.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27361583548.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512b84687d2---67689611935.pdfIn PDF document text
    • http://rilta.net/userfiles/files/nutaluxalulubupifutiveros.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210927_AABF8551B81380C7.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/4040435696.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/puwufudemado.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/mevaxosakotapakituf.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408ab062134---54138425566.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/dguplpoqfovsnl7u2ecitj9hg3/14755234826.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d7a9e9472ff907e00b1199d9ab5c1859/genamov.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/76633780324.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/21558287393.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/40161921473.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/xinadifipelulebudepino.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/91402855185.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/vigitikugarodip.pdfIn PDF document text
    • http://elskenecologie.nl/files/wadizokojaseka.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/mafid.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/22824321617.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/lisimudixanapaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=increase+reaction+ratePDF 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_off0000b173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB173 10128 bytes
SHA-256: f1d91be0a3743434684c0d1d02da8b9c170821ee3aa3dfdfc078cb242f1acb7e
font_01_sfnt_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 17456 bytes
SHA-256: 7d7db1455c77f9cbda09a0fa3ff6163e9bae46ca4a897f3cd76e79a996bdb700
font_02_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1