Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1a653744e9ebfe…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 19:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5dd57073782f314649d02921ec3c4eab SHA-1: de16923af6cab7ac92a0f22f1cc6a71d75b45c7e SHA-256: 9b1a653744e9ebfe898dfe2dd19663eb387148c247a7b738e8325f6880bd5b3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://noithattamphuong.com/upload/files/muwoderupomi.pdf In PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/xisivofagufififa.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/66398796367.pdfIn PDF document text
    • http://fpole.ru/sadm_files/97010862093.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97677690794.pdfIn PDF document text
    • https://alkoplast.rs/files/zamogeroruxagivi.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/65687219493.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/93314679605.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/24019469092.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zemalugenabobagopugekemel.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16085283c464f6---26413524178.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ee98219e5---59380178156.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b54e59f40---puner.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/xizaxivemuloso.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/5155058776.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7e8a3a1---31987922639.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/roxikozu.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/lobosikima.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5f8021cf---bavudi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210815070109.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/zafimusatak.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe92ad1e90---15459040732.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8a6cbff51e024c869935fa48fb9bd072/suzidotegupovefa.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8ce80c95d0feb70f7271adc989d72f24/25027314409.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/tenijiroguxidarebobok.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/redegumarudevope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=meaning+of+employee+relations+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_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 15264 bytes
SHA-256: 1ddef9e27aa13fd26c35d146f091a8252fd51cad7683186edac161a04e67796d
font_02_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 10948 bytes
SHA-256: 9508a204ad83f0e7f71caae2bdd93c8885dfe68489bad3b3a37b162ca24f6e8e

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