Malicious PDF — malware analysis report

Static analysis result for SHA-256 20eb331ec51c1789…

MALICIOUS

PDF

77.7 KB Created: 2021-07-02 06:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c8f18b635ab5232bca2fcf081eec1700 SHA-1: b1b61bb5315efb79d2ac185c558f596be2512893 SHA-256: 20eb331ec51c1789e36a63c7ec4611f123b8791236d77fb5ac1d4ee09743ddba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and link farm nature align with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=que+meaning+in+english PDF link annotation
    • https://85097781.com/upload/files/84501573544.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/wufivufewutinapuluguxek.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/439f96d6293a0b7ca1eb2f956df1af6a/gawoko.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1b5ed3d2a---15549105390.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db37d29ba9---napoviw.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2c03ac28e41e180e122f16f3caa435fc/naxujabizefexasu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/nafifobudogiremulixupil.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/8409038707.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mcf0vtvhons0p8h6l1b2kol4rp/78686485401.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zinex.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/67e5454a579effddd6c5af098753556d/1359957334.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/zefazevoziworewev.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/96480168816.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/43864425765.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/701b024cf6da13e4ac2549858b81f5ef/83400562985.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/20088905826.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b34c3c4eabd0ef6b02c5951585b8b1a9/98286881720.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j35cvd8k87s2fp0mot94u36jg6/30261110690.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l900tl6pe6np6rnvjjmsllepm1/nugapewumabugogelevunavim.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/vixuxijowowaladeguku.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/putddlk6gvc8caa8bq6bqbbm83/9473887845.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2ospf6m5qbq1sld4t6956na2th/59682599183.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/41729649436.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_off0000c44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44F 10396 bytes
SHA-256: c048a917c800f3c604bf682b3f337c4ceefede48677615931b76b810175ce1e4
font_01_sfnt_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 25928 bytes
SHA-256: 7f78bd44ace91616906ec8395c3a97cf315edb23f4f4cbb3ff30153c803a5cfb
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1