Malicious PDF — malware analysis report

Static analysis result for SHA-256 853e715354df5c13…

MALICIOUS

PDF

89.6 KB Created: 2021-07-05 00:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0481b4475bd64e804f402837ecdffa24 SHA-1: 4e49d37fb8ad9ce6203b852176011e9268832bf8 SHA-256: 853e715354df5c13269baf7f36b7c5b5dedd1a9f5dab299f0114a0c3d21ecd0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous links to potentially compromised CMS upload directories and disposable hosting sites, aiming to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to facilitate malicious downloads, likely via embedded JavaScript or by directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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.
  • 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 http://www.iece.in/userfiles/file/37199127457.pdf
    • https://arichaindia.com/userfiles/file/rifafu.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e8d1ccf18ecd5344ee3a4c69fcf28c72/56971870389.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf097d8e6---zeliwatij.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/25228795195.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6pim696bcjcborib3ce0gpqpsd/jalejobadufowipovelija.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a454c00f538ba1108607b057f6454607/13717255736.pdf
    • http://driver-jazda.pl/upload/file/niwegogazamurojunikure.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdf86ca74---domeruvawopajiroradunusi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045c39c7e0---kutij.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec40984abe---60066966742.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9b83c2fb6d03ba309f935f2374ea0ea4/jejudopar.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ccbe1233f---liduzebibewojeko.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085626452d2f---pitabefuxawelirekanuvo.pdf
    • http://banhangcongnghe.com/upload/FCK/file/mofidisak.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gjtnqau6j1ii2glhi55jp4hmvp/17676490517.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c0af10421---26606550225.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/20cc238bf97bea17f6d5558c7684a1e1/fifinanu.pdf
    • http://mini-garden.ru/userfiles/file/pijusi.pdf
    • http://axwelindia.com/uploads/47223865396.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0b079c26c0bc82b14b25b1046160210c/limotap.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e92d1694b3---sawagegegala.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e9ada11c3f58f9c31d6d6a913194175e/26604510940.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d89195bb---1541568727.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13166977712.pdf
    • http://archerelectricsupply.com/userfiles/file/lijiviworizosini.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=forest+guard+last+year+question+paper
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33a.bin
e8641fb99b5f5292432f6b1cd67c531b5c9b8c53dad90fd2a5c9faba69f1733e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 10904 bytes
font_01_sfnt_off0000fc0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 16792 bytes
font_02_sfnt_off0001141f.bin
1e20d629ef15740ffadec0ea5f0a09def5b0784dd1ac94d13408a9c29bb8a7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 17904 bytes
font_03_sfnt_off00014328.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14328 16092 bytes

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