Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f6cb4afcad9da3…

MALICIOUS

PDF

142.6 KB Created: 2021-07-23 20:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: deee45d25061a78c5b4ee2d99f83c8c4 SHA-1: 8e38fd9893273af593121d664acb560aacdcdad1 SHA-256: 13f6cb4afcad9da3962f1b86d63c53ed386f7ebc821b560633cc7da5d69e3f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://citescolairedeledit.com/include/file/81155054979.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1436d9e6---tibajagekurukazipesefab.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/21650e062d8bf866d739fccffaaab414/lagijewisagomuvemigozapim.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/91714994504.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/wunutigopalakafadimorili.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739dc95a1e9---56497657449.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/51360875324.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/422f489dab78bbc135aa17b33b812b9d/sepodubusefovo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d7ebb6f04d23a29ed9f670b53708daba/potidu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bb71d814a20d72c1ef4c21ab4cca436c/4793389713.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2d074764a373a58c4dc7596ad50a3856/xerotudon.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f06dc7130---jolonadaminosa.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/84733630834.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/76366326264.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0hdfl70o975k1mpth874uvk605/79521438241.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/35334010625.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60de3d49cccc3.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94350456390.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/zigurodekuberivisegi.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/vupadaf.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/80639149081.pdfIn PDF document text
    • http://russia-ex.com/difuxudo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca2a31cc3fa2fff219a4eda06fe3452e/28392236896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+causes+and+effects+of+russian+revolutionPDF 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_off0001cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBBB 17496 bytes
SHA-256: cedae4bc8dc912889209760b60b9be42400496ec650dce950b0692cf7154ce78
font_01_sfnt_off0001f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8ED 10732 bytes
SHA-256: 6b96098bddf7e8a22bd70f6ff9855af4bbc7f08e144394d6c10b7fabb371bd55
font_02_sfnt_off00021194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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