Malicious PDF — malware analysis report

Static analysis result for SHA-256 76360f1f9f811f81…

MALICIOUS

PDF

159.3 KB Created: 2021-07-13 23:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fc3bc1f54f06f5a090eb9040485b18f1 SHA-1: c6409409fc6c33e91024b84f7ca6eb44ee5dddb1 SHA-256: 76360f1f9f811f81e85ca925d2192098016942ab6760ea4a80ffcaca8037514f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised WordPress sites, likely serving as a link farm to distribute malicious files. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common technique to evade gateway scanning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://cructi.ru/uplcv?utm_term=ms+office+2007+notes+in+telugu+pdf PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2356b358---lafokizozetukofexepaburuk.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/70006236040.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cae19b061a1b1d267962bb9b81802918/kajofiparaxilotefazi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3149a8188---lidivipu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c79e4255be81c777e64749b1f072a773/sirajibu.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/kogukarupejolusodotom.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160de0778b2049---52055724976.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/muzawutujavetake.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/kcsl07lqeb8q7gbb7m30c54q6m/32126013548.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pirozufepunaforasawu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31d46b1c7a99ad99a4f15fe1b94f5ee2/kiwagevego.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7ff557b539a02105dbad28273d28374d/65595027658.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b7ed6e4226158bfb0006d07077bb8684/zuwipevikatujukiwo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f11a5261c2---32317455554.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/totazo.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/28280065485.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/tobiwaginelemosinobij.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f113d131b12144c16150dba46aabfa8e/41382016398.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7e696qp0k980kv1h697kcg1e3c/8460443547.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/pakolifizogekomi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6hhprdifmlm973me2ulft51lfq/58197689839.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/nejenawadu.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/vefokitapajadexaseseber.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f93ce55a---34165418553.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/42553919175.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22766 10916 bytes
SHA-256: d18b5267c4e32c1a2195b30d7f0e8d977a56644e258f59eda4ad23cd18453b59
font_02_sfnt_off000240b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240B5 18216 bytes
SHA-256: dd3af4ed79c401169737226f256fc63c12aca5e6d3457d875c097905fac16e15

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