Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fa16fd895a9220…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 08:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ec61521956bc84522422f005d2ab10e SHA-1: 76609ffea8a6c3615f70a7a3d1fdd91004df4077 SHA-256: 19fa16fd895a92206efd3718bb8bccb9ea461c326e0146a9f74c2610a8fc1eab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with multiple heuristics indicating links to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182957c653---80759205009.pdf In PDF document text
    • http://thaisomboonautopart.com/userfiles/files/ramixujuxoxira.pdfIn PDF document text
    • https://timminsrenovations.ca/file/vPxf9MSz32fR6bfA.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f39ee12a56f35c545695587a489dbeb2/rujebowodisufuk.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/67631970274.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/39181197287.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/bafisoxasi.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/17515991325.pdfIn PDF document text
    • https://amgaa.org/temp/files/60823052921.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/464c8222fdd0df80ad536c0413b1d6f4/50161222986.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/61486477822.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/20312980667.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/91995068813.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901075954901585.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/20541064332.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/63236992917.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/53349886025.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/9882034549.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/19379aae9f431fe3a1e139e61237fb0f/20641376201.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/muxebe.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/xigetifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=websites+to+watch+borutoPDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 10496 bytes
SHA-256: 4efae2791064645dac87e3229a7fcd12c899265c58c720c8850a314b58dd360c
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 16692 bytes
SHA-256: b092698bbe22213c871ba57697108376880c1b21e271e5b97f77d3c4e381060a

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