Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35ab9111dc3eb1a…

MALICIOUS

PDF

79.3 KB Created: 2021-08-29 18:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 95888f44f681f74128e4623333dac767 SHA-1: 7314ffb882b16dfe0ff192335710a51879ad4d3e SHA-256: d35ab9111dc3eb1a903da0619ccc293844b19bf4ccaa8144e8de4eefc09dcce2
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised CMS uploads, a common technique for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. No scripts were extracted, but the presence of numerous unknown URLs suggests a multi-stage download or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a2f73418---vedederezironomenep.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb0c9a647a---kamopaniv.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gugebatozirujetajula.pdfIn PDF document text
    • http://qzgj.cn/upload/file/81879110158.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/jebaw.pdfIn PDF document text
    • https://fallsplat.se/file/78770260159.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5914cb104---muwedaven.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/11670410318.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/56501083769.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/21879703120.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/79975104734.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/nivaxoduvufadodotaxow.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16088389f9f0a7---bisulip.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc20a5f193---zejiwejobuxurerizaler.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/rigexutojonolejok.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054b555a86---66284458039.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/5795183894.pdfIn PDF document text
    • http://baoveantam.info/upload/files/bunomefefutabureno.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/bibejenaxijo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ddd48d1607fb9404083316fb1baebf12/56206219947.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/68028684863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rmse+in+matlabPDF 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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 16768 bytes
SHA-256: 91cd905d33d4b8aaea582762d5a0490333ddbc964c579cccb56cbde939a1dd6e
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10236 bytes
SHA-256: 55979872db85146e498d25b7471880725e2cf821a8857e9c0683534730e75193
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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