Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0abc9bfad11fcb2…

MALICIOUS

PDF

104.3 KB Created: 2021-07-04 06:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b588d6ce86280048c48b74c7cd996ee6 SHA-1: 20494a0bd2e052fc629ad29f977ff0cc18a27e3c SHA-256: e0abc9bfad11fcb2f2864c844085241b94014995b80ada21e295cf4eced4c31f
184 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host and distribute malicious content. The presence of a download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3a236c45---37968880186.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ghu34tbvig1p8ibdo5ajllv790/7782055149.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/47582189463.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075315ed900c---vujawawavudufezexuze.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bvl45uduqia83m17dllaqar8o4/ponesodokuzosilesanu.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf585b3a61---wasomamupuxoxax.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3homaitidd8rjqd55g0uuqibm2/47660861515.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/85502412256.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/58038629077.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607418ff6724e---96812752648.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/527cd6cfd0817034115536a35b698848/kiwuwumetazuwiveduma.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a2449c32---jakijidiboxef.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/gusiko.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e102fb5e---lejuvetufaduxazemuzatak.pdfIn PDF document text
    • https://schmitz.cz/res/file/movop.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/amttqo5lgn7jolageugsucbiua/wewufijupajiza.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/surafutegusarizuduwu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/09efe56dfd76db35cd73f3a3a6625dd9/98250423595.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/mikidojuzosowoniseketoza.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/12588320616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=elena+gilbert+from+the+booksPDF 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_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 10876 bytes
SHA-256: 0986b1393ac1859b18dd2d3b5dd1e1134edace9c7dab5eb01bc5fdf315796c58
font_01_sfnt_off00014d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16573 17920 bytes
SHA-256: 72f5d09b550b998682450b62745c4c9d62364c1ece95b8f284ad8474df1c9e10

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