Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb821b5df2c6323…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 18:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e698af2ad4b7b57e397677d6adade871 SHA-1: 219abdb1317f40f8668a5b23f41d0858ec76ed0a SHA-256: 1bb821b5df2c63230c1dd69881e251823299a2d76fd9d931fae7ee778f9ac0d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=wolfsong+tj+klune+pdf PDF link annotation
    • http://hitecds.com/userfiles/file/44666323017.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xamiva.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610726d4b0c82---47056291265.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/rowazevituvewer.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/6860710221.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430075158773664.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0d9e6dcee62fc84ded143d4d179cc7a/sepebifavisufelubekuzodu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/22726001366.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cbf029543---40754197921.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/89266825075.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/50282816712.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/rolorojifak.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/xujonilimoz.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d9eb3281484f6a1016fe88a43f0b59f5/mevowexezu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3b357eda---dotiviluzujemopov.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4304b597801b4fefd2adc6ae1eef0724/74939042328.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a23eb33c1---joxuved.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/27594123085.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071229552118---76192365805.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc9e8951a---sibizerekibesosasukun.pdfIn PDF document text
    • https://grandmake.com/userfiles/vezalujazurolasotazezat.pdfIn PDF document text
    • https://superchills.com/userfiles/file/80448403243.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7dc532085---jubezikasomovar.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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 18012 bytes
SHA-256: 314a7bd215a69324993c12992a8e73b7fa543b955fde11613f968d6d91696054
font_01_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001371c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371C 10636 bytes
SHA-256: febb2723d9313d5452a88483334542a0e4088b57dc51564f05794c00d4fcac61

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