Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd8bc791caf14ee…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 22:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d31de4011947c46feb73cca1dbcbf21 SHA-1: f877271bffb9f037aa94bee131a4a66f1c61077f SHA-256: dbd8bc791caf14eef7ad4ee33c4ce75e8d7c6d1e8af9a2f04e63e98d351cd913
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs hosted on compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple unknown URLs points to a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3aafdb9cf---lewuj.pdf In PDF document text
    • http://cokhiminhhien.com/media/ftp/file/bolunizumufazul.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6oonjoungt1fns70an0436hd8u/dokutigegibawezoz.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/nubotovedakepumedu.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/fokiredokotirofopi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160929c01ed39a---kolub.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/94810732211.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/62016929844.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/badusekatagozij.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/zevunalatebifafovokufa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a175d256212---furaxudigijunuxabajun.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090cd5a49275---kaluxivoxifiliwo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a8a87c26fed17cc494584a4b3d2401e7/fapovikazizig.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3cce3fa55087e9736e55b34f8367aacc/86425134281.pdfIn PDF document text
    • https://emprenderem.cl/files/36168158830.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/zomirolowo.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/pusomeguferaputatevokofo.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/gotutupokovodupuvudima.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160760ce86629c---73652586814.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d430661bd---gewokopakafiw.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/10754813280.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/80456016033.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/g87pbuh0sfedfmaookd4ebs10j/julenoxumefebumobid.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/naxoxugujofizezaditife.pdfIn PDF document text
    • http://praguetransfer.com/files/file/gesavuzodinarufasef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+extract+text+from+pdf+c%23PDF 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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 10548 bytes
SHA-256: 28c082ef29da27b6b8b4b786015cd25b52066713acd4846c012eff30949fbab3
font_02_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 19216 bytes
SHA-256: e0f0cb8d487324742e1ae493e982919e45119e57b116df9be2ba37cdb7974d0d

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