Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa4f270c8d6820a…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 23:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a18bdf11f9ff31f5c34b5d6d3bedf733 SHA-1: ac2c809f107759afd3227bb9806c13662cf6bb2f SHA-256: efa4f270c8d6820ab0de3b334cca230bd100e531d58caf40086abf3b00de91d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or SEO poisoning attempt. The presence of a 'download' button lure, combined with ML and ClamAV detections, strongly indicates malicious intent, likely to deliver a second-stage payload. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://crewmak.ru/uplcv?utm_term=environment+and+ecology+pdf+by+shankar+ias
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1a289e6c---tumadajenebufixomujejago.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o32adqq8mpvn9drrtv6f0p2rc2/34596365954.pdf
    • http://bptramptour.pl/files/file/vevufeteredovexed.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6632937f0a7ca48652054abbd9ba67f5/8658920842.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7nssimlfnclesh0sjs0jqc2i64/61381522709.pdf
    • https://aartipalette.com/userfiles/file/nifevigivadelefidup.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070386d076d7---20377297996.pdf
    • http://gtlmarinefuel.com/userfiles/file/55597479437.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16070efa2d9403---12874707349.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/delowizogerupesulixisujem.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/cjj3mg7nmspqipvo4v5cc0ecp0/13840100543.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/rpbmc8cv2iqa7m9239spvcpsjk/gibagagunisofaxekule.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96af10f96---turikejiziremanafagako.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/zejexoteboz.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7hl9h2c4o58hbe7p63nf35f89o/96118465990.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/afb1a5747fd761989841fe12d743b3b4/rafusexa.pdf
    • https://faprosid.com/file/71968350012.pdf
    • https://tiklatakip.com/calisma2/files/uploads/dewavaxenarazudijosilaged.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8a0a50f867d99b1cb40d1f32ccb805fc/zabiponidanurisogir.pdf
    • http://www.ks-zahnarztpraxis.de/upload/files/tiwetedemulom.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/fb1049d90726e959cadb3d3c451aab57/xonep.pdf
    • http://wildpflanzen-planung.de/file/31336554045.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c9.bin
2f94e7dbb8061c2c20bd4592791191875b920a98893f0ff943dc10b458f58be0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 11460 bytes
font_01_sfnt_off0000ec48.bin
f8558d20a51c974e1b5b2f4a3bd174d2e5f64a287c4ee73b4fd3b0b8455df339
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 17204 bytes
font_02_sfnt_off0001192e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes