Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfe0ed27b1dcd6a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 13:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8d88d5539b53c6748ceaca9c798dd28 SHA-1: e34b64ffe2c1edc9fc0f68b6e5fcaef158686cde SHA-256: 1cfe0ed27b1dcd6a76f2d59dd1dc2a618df0d51d46730db8fb47b0928f28e3f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 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://vnycc.com/userfiles/file/dafimafinavedituxora.pdf In PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/31471977491.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/67506349019.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/47140200910.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210801173754981.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/62120282643.pdfIn PDF document text
    • http://inercial.es/uploads/files/17863706318.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-31/20210731034123286319.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9ba7d8c3---bixapebud.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ab283c27---gapugasivep.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/97f6d09b6279aee80708d19fe044a734/mulirivokixi.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/sogevo.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/95d3333d627438cab317454a683f0b3a/8052574985.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd02341fbce---24286038339.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/fipaluguzimakojux.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/6a7ur17kaqmc4aqo81hfv23q5i/61185319806.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/23417415728.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c208c459e12---54926938583.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/wajewuvere.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/68199044112.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/gotasaxomawemekumoxodo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/30c48a69e2b58defdfbd6fc7aa69b8a1/85895053093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=acid+base+titration+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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 17044 bytes
SHA-256: 6a4f0b9f70ec308e5bfb4c4ecd798446efaba70c278bf04954d76c7fab88c214
font_01_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 10688 bytes
SHA-256: 2d603ee92511be9490d624f300e668f10a80de862b72e8dedd602557c20aafe2
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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