Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dace3afb7f6f2b0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 10:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4af0d43d8c3be42dd7d79ed0c0350e2 SHA-1: 3e4c65cbfd69115600c7b325e0c60b071193021d SHA-256: 1dace3afb7f6f2b0c95b4b00ba5d8ef426b18a8200260c9f2c8aabf63f8b9ba9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm or redirection scheme. The presence of these links and the overall structure strongly indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://arisutour.com/ckupload/files/walagibuxaxixibo.pdf In PDF document text
    • https://gbp.dropship-online.com/userfiles/files/68577675278.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161421573a283f---buvoxofipuxa.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/lafatomalutigedemovusib.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/fokitenulewineneduvab.pdfIn PDF document text
    • http://sinoorchids.com/image/file/63841530791.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/jatilogifulanugogivuko.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lasipa.pdfIn PDF document text
    • http://sin-hua.org/userfiles/jonagesexidapekoza.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/7311076948.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/44641482426.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/60377006536.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/bojerikaxibuvilinefuw.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/dolikunoponipi.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/67531975519.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/wutana.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/46465650019.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/89621ca66db0507648b6ff33530fc648/jezuvuxotemidavejelo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613638f22886a---jawis.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/wodagavesefisegunaxanizev.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161308521864ca---74476991487.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/vovumusogepogiganekimowej.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/66821954449.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xawelifubiwalemet.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/mapugod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=choices+stories+you+play+mod+apk+unlimited+keys+and+diamondsPDF 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_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 11116 bytes
SHA-256: 204837528d1d8eaf135ccfdf1bed0cd35a3e1191bb0be527b02f06de249e38b4
font_02_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 16400 bytes
SHA-256: a37f4300afb5134f5e8cce3751b378520c456010db338e49c7cb08d9157b39fb