Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d896cd837d30691…

MALICIOUS

PDF

99.7 KB Created: 2021-07-02 14:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a88484921fcb512d9d59767c8d650a8f SHA-1: c63985e2599b958430641aaec59657fb18770bba SHA-256: 3d896cd837d30691caffec378f9d0fcfc007abf39dd0b138f2e30682757bd746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=economic+development+through+international+trade+is+an+example+of+what+type+of+diffusion PDF link annotation
    • http://dolphinkorea.com/files/files/pidasowisijidoto.pdfIn PDF document text
    • http://rubensova16.cz/files/file/99566984039.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c5b110296f9a888d3d15eb988c262eb8/wibizarufezul.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/643f20e1507261bf03d794049a41a838/41162967727.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/cc5ae2735222f89223ed2c0c8da6d297/82092007190.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c655637852---vowiwi.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/48652790700.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/75320877563.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071396e8083a---35026483812.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/tigomewani.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/3d7b6c69992bf43247d23ade61ce8f40/93744028860.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/70735565553.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d38358acd7d---12362880939.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gasaledekapamawuguwomep.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210623004521784.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/girobuguwetigevixir.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/033c7177f9bf03f4e69fbe9aaab65308/nopimifo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5f1228dc2b1071bd524d2879540a6ebe/kawugoterunutazip.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tefipaw.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/soxofan.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/darelubipubidomejokojut.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7dbdc95c36---72883400135.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_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 16672 bytes
SHA-256: 6f091068996469a4c7f3cce9be94689eb39092f1be66a1f5e148e0fb8d5fc719
font_01_sfnt_off00014d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D72 11520 bytes
SHA-256: f7cc2052df50a6f438b1960a164874ff1ba876e3160b71029f7fb718fd0be1f0
font_02_sfnt_off00016866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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