Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d71679c11b1ead…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 03:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45df1ff34e025c9f87328a44acb3ac0d SHA-1: 66b02634386a528ee20b8f107fbb18df10b76aa5 SHA-256: b9d71679c11b1ead79deb294714333ac84d37ede0173ada4d4d014ed3da9bbac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and heuristics point towards the exploitation of user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://sdhouse.info/ckfinder/userfiles/files/sazafulogewiro.pdf In PDF document text
    • http://inspiredindianfoundation.org/uploads/8038504018.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/82528227701.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/28400375476.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/fovifixemabiwagi.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/3948995414.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/lofipuniwixalozazez.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210910/16312761945765.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/37564874645.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vovulijakurerunuzabu.pdfIn PDF document text
    • http://chemicalengineers.ie/images/xobanixanuzoduxuluteno.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/92357611126.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/8215541290.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/e385aeb00e6a658b599e457a451b0240/37805448603.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/66856222650.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/47358925169.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/82180181511.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133a57c6409c---taxefopotino.pdfIn PDF document text
    • https://southafricapools.com/contents/files/42078715913.pdfIn PDF document text
    • http://liluby.com/upload/file/17221540758.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/duxivuvusew.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/pobetosunigoxi.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zazozijitabutaworaxuxili.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lepigivemafikozibo.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/wimasologimemigaxomor.pdfIn PDF document text
    • https://cecprint.com/images/file/kuzupipoban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=streaming+friends+season+1+eng+subPDF 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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 18052 bytes
SHA-256: c0c6042b606510d5d07ad4b594622764f23cd8744009b272303830272a3a40c9
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 11020 bytes
SHA-256: a8e36ef9706498b4b00e017d4b0dc782a25e2b2e4aa4ece72a76cf677eebb5f9