Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bb039f1caabca4…

MALICIOUS

PDF

98.4 KB Created: 2021-07-01 18:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8a7d89a0e40b03be588f2663910fc36 SHA-1: bbbc9036eee1a69290ca36b8356bf2afbfcb594d SHA-256: 63bb039f1caabca434f7f55421d83589617a931062ac4708dc87f8cd64b145b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. ClamAV detection and ML classification further support its malicious nature, flagging it as a phishing trojan. The document body is unreadable, but the presence of multiple compromised CMS upload links and disposable hosting suggests a tactic to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/elv24ipt5g4ea10s8f2h3c10jr/tebegimikupa.pdf In PDF document text
    • http://tfforming.ru/d/files/73454122427.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/liviju.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/attooisjpiuj4bhhtp01hi1pk4/99337700149.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aa040c3---73715744730.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/38356984caab2690516fdfb21e53647c/xulobit.pdfIn PDF document text
    • https://ivanamihic.com//files/66169240950.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607547f1dec49---kezajomusorip.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2bd77447---misusoresudefigepozuten.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530ec6eb1b---80361201648.pdfIn PDF document text
    • http://strandedtattoo.net/file/vemerekeraxedakorev.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/mevikexafatajexabo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/34ml0m6dqmhm1jtlq8c3r9ebdm/xekiwixavuvisu.pdfIn PDF document text
    • https://nevisnews.com/userfiles/88460369979.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e65dea95eeb83c144cd2cb2fb166a47a/nidejawabaruwidezadem.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/25081230866.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/81930667296.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210610150301_lhi3ju.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kajifixam.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a70171eb974c6936fe940d55ca95268/92394868833.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b20fe6a7aa3---mowekapazazototuvexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hack+of+hungry+shark+evolutionPDF 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_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 17408 bytes
SHA-256: 57837efbac6dd26599561bb5d12c1127e1f35b4b0e17364885a44388600b0ba3
font_01_sfnt_off00014958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001616f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616F 10980 bytes
SHA-256: 2b646603842f0408f66497756f126bffdf60acf7e52a234f3c19462b86f872c7

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