Malicious PDF — malware analysis report

Static analysis result for SHA-256 3527a0867c792f43…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 02:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8160c758ff98d4b78954864377d6b4f SHA-1: 3d382e53efda5c1b4175fc50a2c6fd30ba3b3ce3 SHA-256: 3527a0867c792f4332b39fdae95f61052fccb8bbce9332de816ff625c96054c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://garglob.ru/uplcv?utm_term=copy+selected+links+chrome PDF link annotation
    • https://ptogel2.com/contents//files/pudadufuwemibelixesado.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa1d3e594---zadev.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/gomopi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77c66c7ca---37954071006.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/32670283105.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/xarenumaduravefa.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/24820260068.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/58908648677.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kibixapulil.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e1ea9b468---nulowufonofogunob.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/71602498647.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db88dc9a4---54624239043.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xilarutiburilo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3877c735b---ladopikimozevigeniwalibi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rcd3i22gbj920ia4ablflfhnig/solilopisenuted.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/zawolovepezatuwarebipok.pdfIn PDF document text
    • http://air-con.ru/upload/files/62635784595.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lanaralamarokilapadigi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd74bb009---pipuledumimemilugini.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/edbd6fef71e42778a009a7ecaa24f977/gobaranekazejijafikidijo.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/98600188364.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/visasepogosodimotewixizet.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/70717284167.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vifesiguvunadexeduted.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611e51bfb1ba7---35401699464.pdfIn PDF document text
    • http://hitoduma-d.com/files/files/83684210483.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b8adc14125cad8b81eef738cbcbccbdd/79123776480.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 10856 bytes
SHA-256: 4cba0b2f75d533c472d0b64d8de8120ad727a11aa5fc5f66ea2d740ff11a165a
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 17972 bytes
SHA-256: 1b027030d98b1efe6801d5709f892bb9cf7771d60a60a33761718d4fd36b04eb
font_02_sfnt_off00012c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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