Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc32792d31acd8b9…

MALICIOUS

PDF

89.7 KB Created: 2021-07-05 04:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bcf4f6a2b2462fa5cf0c0a6ab46dc6fe SHA-1: 2eb11f5872b15cb6b5e2783d563ed3612ecc6b21 SHA-256: bc32792d31acd8b9ee252e6ba94b8717c0d0a1aca7dfeaabbd27cd0491c0c1ed
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The presence of numerous URLs, including those pointing to compromised WordPress uploads and potentially disposable domains, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://berbun.com/user_img/file/49217794816.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820440115b3---65379721473.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf9b097eb---68477928659.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/pitevujuxasetuxosuv.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/35319528035.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/dinupadedolejoxubap.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ff0027af824de5bcca1d3a9aabb69cbd/72144993981.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985bbb2785d---kofelimu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fs56bq3deq1am0ij35e7pl7bnp/8722295699.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40fd0d6218---64291497291.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba03dc8e31---70843978753.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/31560508262.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850dfd548f7---devixe.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l1n24grk0i1t4sj9pvbgf07pt7/21277992950.pdfIn PDF document text
    • https://mattress-leader.com/media/tovemukuzad.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/14469261430.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/sivugusuxi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/cc0352be5afba7fba19985ac6fa432ed/rizefibivufonekotesulutu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be97e94385---97955264270.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c17abdfd545dc5172a9e06951e57e3c8/68983716882.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/reguvefuxifabuw.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/38741686086.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b74319197a1---pitokezopopanelofi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafa27277---levej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=49.99+dollars+in+rupeesPDF 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_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 17272 bytes
SHA-256: c6e41111b469f388eed7258db008a812fe8680409c2cb891244e5425e1d57c28
font_02_sfnt_off000141b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 10604 bytes
SHA-256: 85e22fe3e4c0066d8a29d84f8d68bb23a9ce42b1fcbb8eda5824a8d1bc8b5863

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