Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d020cf84d886f4…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 05:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 56fc9989e62928215bbe3546c0e005b9 SHA-1: 8ef50014cb687082dd1bd9a7f58d5d74ab2bc4dc SHA-256: 24d020cf84d886f4fe426346f4675b912c0f6119c2b893456a00842653a2a171
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.urbanwaterways.info/files/tedepo.pdf In PDF document text
    • https://michelbarbot.com/upload/files/fovizuguban.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/54491144480.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xuzavurax.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/xifodotoxamupa.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/26349150823.pdfIn PDF document text
    • https://phuquiland.com/upload/files/24374649827.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d627cae76---xegapuwifulazonubonemade.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/67111341003.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa70a2a280---dilofezetuxomagilej.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/68343584578.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109090756535620.pdfIn PDF document text
    • https://mkart.it/uploads/file/ninakerakikonoriwepebed.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/42162330701.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f32f2651---99186077566.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mewezoziludajexusis.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362af4d839e---vusumifokuk.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/27829791306.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e62182b5769507efbdf5913755fff033/74838488680.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/zirarubuzedamupibibiti.pdfIn PDF document text
    • http://viorina-deko.com/images/file/zutuwazivu.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109101819114419.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nllnv3mvlidtnvqkh45jaonvht/7126421267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dragon+ball+online+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 16316 bytes
SHA-256: cecac62ddf9842e24e5aa295a7437217c35a03ea3258f310dcaaa5844d6ce37e
font_01_sfnt_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 10396 bytes
SHA-256: 0400ead12b61f70ea049b0523ecadbd40965070991ca209fa46cdb94b1bba258
font_02_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 21080 bytes
SHA-256: c5259d19712e7b8350d531ad357516cc8fbdf94686fbadf3da9e0e8749b045b0

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