Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eace0dc53f91bc0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 11:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9010b383ee8badcffd5ad40b0ff85e6c SHA-1: 17da7f760a216192ec116f543d168305f5663c7b SHA-256: 1eace0dc53f91bc05ef01ae1ef77a44f52b2ea88576c7dea03692c24badabddd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=ultimate+epic+battle+simulator+free+download+android PDF link annotation
    • http://emblem4home.com/UserFiles/Member/File/dobelitujomu.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bovezikawedopilib.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b241965f---8643968202.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f67be718---dolutoxamunebabafo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/69b06916635e93b7cdc8a6ea54fa1cc4/53266781593.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/xewuvo.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/kepebuju.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/lotirute.pdfIn PDF document text
    • https://htchninc.com/d/files/94799839731.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/40217730472.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/wogilakikesafo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/digamajatinu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tobojip.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xiveziwitovumugukadow.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613314557a6e4---guwogawidepa.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1b303316---73108442818.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630685643.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/82791086531.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/lomajaveronivuvam.pdfIn PDF document text
    • https://thehouseproduction.net/file/11066685304.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/17q662npevv7sjtp8cfi1csqh6/noxemikezakilumagu.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/todafen.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/repijotofipunevizuxesuki.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210904053625.pdfIn PDF document text
    • http://halaljones.com/uploads/files/labin.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/sularexafene.pdfIn PDF document text
    • 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 18656 bytes
SHA-256: d1975dab003a0cac3ae0d5773c57d50c9d687fdbfadff54fe3e24075664bccc1
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 11116 bytes
SHA-256: 2ea9b5117e27c59d210d4891050e1ad4d98f3c37840e10f80c1386161c3f07e1

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