Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52e263ca2bc57af…

MALICIOUS

PDF

75.8 KB Created: 2021-08-03 02:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d9336a7efcbc0fa8f8032c0a3630f79 SHA-1: 5f6a5b7a7b3f963891031fd17342b7cdde73703f SHA-256: b52e263ca2bc57af3df1748ee495f26a6ab816e48899c280c923edb23aa040a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting, forming a link farm. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=amme+ente+amme+mp3+ringtone+download PDF link annotation
    • http://shuimotongyuan.com/userfiles/file/58232084699.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48597518748.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/vamalitosefetan.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076193dec95d---73463017117.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/kobalikiradewuxubin.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lefiwazudebabupab.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/sibaw.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/aqalq782ef46vg2pcfncnbs0ub/dufinobogewave.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/waxepovowiruboz.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/48312783453.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/81377222837.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160972037b2543---teketifinikogivovo.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/xuvex.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca671534c8---ferematisu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ec69c23f8b3decbc3918e27f14c32585/10146372787.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95aa43f90---kebovenuxedadovutuzugo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abeddc8d47---wujufoledamaxem.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/15734387794.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/lepisubojamurokegej.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8cf4ed1535cd631d1ffa6123b526fdc9/78498469440.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10de76ffc---vavanonerutudo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c455778d164649936ab7f6029b4ea608/53288522492.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210705063452.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/91383594213.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/pazorip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 10804 bytes
SHA-256: 2a2b54a4c2133f5d07fee42cb660e1eaa23bca32c21b126879afc86e0acceec6
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16640 bytes
SHA-256: 78e47d9e538a7937649cbc469ad7b5f9386fada305484fb547253fd858daa5a3

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