Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1a216f71c71976…

MALICIOUS

PDF

85.3 KB Created: 2021-07-09 18:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d11a7e2128de0580ce62f7413bf871e SHA-1: b048aa8032247d2b21bf45262c2b7579d1431060 SHA-256: ca1a216f71c71976fd320c805d417b47155cc9b48bee4063d76e8ab88962391b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phishing pages. The PDF structure itself is simple, with no executable scripts, but the embedded URLs are the primary threat vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/83cbb652381b19952adbf46b3f322b97/zaluzosafitugobufa.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b426d2bbdcc---kozetaxudavo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4627887e---25192320170.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/37087574597.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pofomijosusezomeluko.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a8e280afdd177ac108736336bc487b4/54068352043.pdfIn PDF document text
    • http://fedoro.ru/upload/file/33091987238.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/relazimotixojusobatexijiw.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bce62d00488---buzanijif.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/xabuledopebete.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/susenefisapaz.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160924fdfbe1ac---85547076982.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/21126609243.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621113353.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/33614575336.pdfIn PDF document text
    • http://fitviewer.biz/files/file/21390139723.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3605a6e7---sewalenuropupulen.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7321afb74cd8facd1b9769443aacefd5/sadavulenix.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac790e79a---babipesitonitodog.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/gazuladusadiluje.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a1e11d82---nepubajulibixedaz.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e750c03d23---19806947017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chopin+the+story+of+an+hour+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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 10792 bytes
SHA-256: 7a71fe1b4bd852f21bba7241d372ef269ab7458da0c7b16b399cc57550dd7075
font_01_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 22300 bytes
SHA-256: afe66f1afdb5c59173c2ed4bad28c9eb0393de2fb9863e495c91b7d6b974b20f
font_02_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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