Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f617c79c2ae016…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 14:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77708bd6be9d60236c05a4693edb2e03 SHA-1: fd8d216a20ff6e7085ee1cd3bf89c9a1c5335960 SHA-256: d8f617c79c2ae016440c4193e8c909d41c4da72a67b747468a32469da1f3e589
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://e-photo.lv/ckfinder/userfiles/files/14501510530.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/to6ul3gj43iten7qmubta7sen3/23927577254.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/wofusixefajoni.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/jerugomusapajumati.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a69e5515c---67357590595.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088198a4c72d---kidipanuf.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/raxibuxekofesukitotud.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/21054135563.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/tmcj4ve92etp94mjgrnebtihil/11094032410.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/5965800577.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54586f3794---gubebuxiritek.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7cbd27d94e82e424dd459428d3316ba2/dewizugowuwufor.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/21244922384.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/19992754835.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092667db915c---73724277680.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b62244f4672747bef74c70314c652986/45029431417.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/16q9ppqtmi4rlmfjm7i1g9qgat/jexuvuromopolonixe.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abae290a618---90600154632.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/40299209868.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/69cdd523e7e8ec95d43b23051f5fc1a9/pekazuxi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16123c33ce7b30---68190571859.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/gomelefo.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/73183681113.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd047b5f855---6381148086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=phan+mem+chuyen+doi+pdf+sang+jpg+mien+phiPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 22264 bytes
SHA-256: 662506b7bc5b679cebb3fdf2c7784853b8b04cc6948a826453b295cd6f33a8e9
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 11168 bytes
SHA-256: 6548c05f5f15bc04fe930e3481c349e5922ac9db7e4fac049e97edc75f9a1471
font_03_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_04_sfnt_off00014197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14197 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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