Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3df946eda017311…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 01:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e7ebb8f61d642d04e899890b1d6e82c SHA-1: 994b4e435d3c2a58c983af5a77f70c50e1f157df SHA-256: e3df946eda01731153265dc909de35fc42eacd652c41a00870bfc5c454aaf0d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also identified the file as malicious. The presence of numerous links, many hosted on disposable domains or within plugin upload directories, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ekrnm239f9ia5r5b3f23jr9sdq/39718489986.pdf In PDF document text
    • http://fmmvn.net/userfiles/files/timamaranoli.pdfIn PDF document text
    • http://elitacasa.it/images/file/60425419583.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ec7617cf0---17016647542.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/62485126540.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/juvigiz.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/97095781631.pdfIn PDF document text
    • https://maisonforville.be/documents/file/62263876269.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130440f0c782---54696130175.pdfIn PDF document text
    • https://sambelteri.com/contents/files/51740817268.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137045181d9f---lipetuzogeburedabafoziw.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/34879508015.pdfIn PDF document text
    • http://hmed.vn/upload/files/12986059384.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109190714098469.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/zubimidiwigobifet.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/80905344230.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/5610871935.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/mogifiroxuxami.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/61911311765.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/70513218222.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/gubiriwil.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/23443163629.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/dafekovuj.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/19620689345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gt+s6310+custom+romPDF 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_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 10508 bytes
SHA-256: 8ca28c2eef5cdba0589d0014ed621e551cf3839e4c474afb923d3fcdcf00b238
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 18312 bytes
SHA-256: 473b305fbc36addb54023517e186f1e3267a8444cceffd54a969f10329028cda