Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b0e05411cc29a…

MALICIOUS

PDF

94.7 KB Created: 2021-07-29 16:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88da6155d95a51e70350aea6a3054156 SHA-1: a8e83b997fbfc7ccefc1161d29bb1068134a2f1a SHA-256: d39b0e05411cc29a8ed37df69d8e35fc10fe38a4a08f050c35dd70a6244ecf82
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/acfj4eupsquguddau660qol9vn/95618681456.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a278d7c114b---sijeza.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/paxuko.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/248e04128372b3dbc48df472673c5631/rixegizom.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/494173ae8d31c021e0f67f188ae30e81/47760446770.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f6add3ad9---70971368622.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/rijivutolazubizul.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bea6548f---monolexinufimajerorulakok.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0augkm6pd96q0oojeln56h1em7/9418059524.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/pakaki.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/12250894937.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/jawoguxatatexive.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/zelajajodiletojuge.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7a17471e3fbd1d7fc39adfa55b99885a/98200652797.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b50b0bb2699---fuveduvafidoxe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607587b64e17f---21635978872.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/78894497376.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/xilosovanunizavipizul.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e89728549---zapuvul.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/109pojb8q6a49fr10mi50rtk5q/dolomajokegovozerukokaf.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/pabozobarukuxuda.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/xasulatededibow.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ruledaxiradaxogidi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/75192301060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sony+vaio+all+in+one+desktop+memory+upgradePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/db48e7a25639a2d285b6c79db8fb0c3e/68062957579.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 17892 bytes
SHA-256: df70192bf58ab68c00c4f41246ca86e98a55e9cf52b7478a81acc35e48559292
font_01_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13977 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_03_sfnt_off00014f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2A 11184 bytes
SHA-256: e0abe05831edfff0cea412a13c707a2e9c8e275f151ece36f4502376dbd58c13

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