Malicious PDF — malware analysis report

Static analysis result for SHA-256 a291c7990dc05974…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 10:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b9d73c9af87b63e1a41bb11b12c16f3 SHA-1: 51b0e17c8eaf43fd2523fcbbec93ada231b49c76 SHA-256: a291c7990dc05974742352107c3bef00497cd0e1845447011a207569e1fb9734
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other domains that appear to be part of a link farm. The ML classifier also flagged this PDF as malicious. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=asphalt+8+airborne+hack+mod+apk+free+download PDF link annotation
    • http://denda.co.kr/ckfinder/userfiles/files/32528063080.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/14532605886.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/37772149362.pdfIn PDF document text
    • http://domainecomps.com/documents/files/60356382628.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/82727241200.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/wadotikagobatesivezefi.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/2560972451.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/numalutame.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/lolifokidenafebim.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/kirexabirofamevuzajekil.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/dikananisasifedawofekar.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c2fba99e---47413188397.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/30377087349.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c08435f19---24755148657.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b559c1b251---lokuzivisufeluredovuwi.pdfIn PDF document text
    • https://ms2oke.com/contents/files/xejesid.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/gebufafipusosulujemafaxun.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/zowuferikanazakafamijoli.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/83533082524.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/75118039347.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/2123348359.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/55285415470.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/tizedenunipejoluga.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc3ff02f3---mugifewivunina.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319fd468c2f---42466515048.pdfIn PDF document text
    • http://babamoleskine.com/files/file/36075872680.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/60877290040.pdfIn PDF document text
    • 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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 11392 bytes
SHA-256: 84dab614a01a1669293e1fd55226703fc83610c972e938b80695eacec5c70cd9
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 17972 bytes
SHA-256: 0012f9f744c835e7a84ea6a700a561689b5a47fc490ceb9d42ce261c6df3c3d2

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