Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc71a6fa767cd16d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 06:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 357177ea28c0eb15e265bfe9704c37f3 SHA-1: a41d838b4c427245e4abad6a793a993cdd6fc05c SHA-256: bc71a6fa767cd16def39a5c46c156710fcdadf53cddd71b064503ea78a61393f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bcae1c94a---lotogoxitexodepugufej.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bb37506e4---31203542262.pdfIn PDF document text
    • http://synergyproperty.com/images/files/16285719726.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d824b08bbc---19745954019.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607147807b13d---kejasopanowixanelodur.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa88a083b---pelusikabimakubifixuxaju.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/33024317000.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/8fcdf7e7154fedf6c1f9da805da79a3b/90535947964.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/banelubukatapurozo.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/nagorositexiwedudagirif.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7cabf3c212ec7b44aa3a891f7cf998d/77728039853.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/xovotiviwavota.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazabowokuzos.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/muzovuzazefijoba.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68d9c6768b6e6718194a2b4ec202a562/84541784389.pdfIn PDF document text
    • https://airbays.com/userfiles/file/67982289439.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wukorojozedo.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/41808811879.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/18569166668.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/dofajidexufanizojuvij.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8a94e8fa0251f065ac670521ed75d6ee/70885989246.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee524d43a54---rovapukagodowepadisubiwo.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/48802987665.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/bonidirapokelezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=organic+structure+analysis+crews+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_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 19740 bytes
SHA-256: b9f8fa4fe8d1a0801c176a81aad9797f773f002d36122850dfac766f17aa4050
font_01_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4D 11000 bytes
SHA-256: 846e40d9036c8a1cc38bd64c1d0f74a653e9bd0f78b69842e5d4c206b0ce0bff