Malicious PDF — malware analysis report

Static analysis result for SHA-256 202f81b9ff4e7cc1…

MALICIOUS

PDF

79.3 KB Created: 2021-06-25 12:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c69d96cb74837012f613ea46f3c0ddc SHA-1: 7d6853e8dc4b3ff803365d8bdd561b3ed9a99607 SHA-256: 202f81b9ff4e7cc13014578b97c17da552152ec9b843ee6d8d97ecf59eefe79f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://advance-pack.com/editor_upload/file/37205325843.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c1fceb7d912bbbc6276c0389788eb3bd/85877431795.pdf
    • http://topcudental.com/img/userfiles/files/90579594048.pdf
    • http://firewheels.pe/userfiles/file/wesadirabikaxomofime.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd2d0b5d2---87305509324.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3099b7e90b---53958693596.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/b9t8b1qdtg2u3qha74st2dc442/vabaxefadewo.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c6aa6051d4b332360db3ffec885fecee/wedoluwi.pdf
    • http://ahsaipu.com/v15/Upload/file/2021551010399492.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e7ffce8c2ea9d399c2504d20b304ab73/badalalawaginib.pdf
    • https://bandotrading.com/uploads/file/25308918180.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/c43ur3e7dfpbpjhgm67q8fkfom/mekifawiledopogejuxetedi.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kejoredomuvifu.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aae68cf3efa---zavutetalax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+cat+has+an+ear+infection
    • 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_off0000d86a.bin
3db0901e57672d26606d9d2c58f95c22b896b3ce6a48c9ae43cf8eaa0d174de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 10492 bytes
font_01_sfnt_off0000f045.bin
d9ff357b4024a28706bb00c414a125bedac16218db26082a6118e54ba457bc32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 15776 bytes
font_02_sfnt_off000118af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16792 bytes

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