Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1446255f0eaeed…

MALICIOUS

PDF

89.2 KB Created: 2021-07-04 02:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: efea6663543299dafa30e298bd0af850 SHA-1: ff1225b537b178f57cef968a50affa92d6769668 SHA-256: 1a1446255f0eaeedf1b1ecfb6e19dcc8d239c42dfe14187cd05f75b1e0fb7ff1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=rhyme+poetry+definition PDF link annotation
    • http://trungtamdaykem.vn/Images_upload/files/85505172907.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710119a45d2---fejirelinate.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/vazenuvi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b400c0063---12077874246.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2efe11ac---lapebezevufugaf.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/718f5b0f7ef6eb200a87630e60cacd1c/97799380366.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a480d84dc1d---48798162167.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/xizuvifatepil.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a077b3681c---dareluvufuzupawuzebow.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b65945a1e81---powomaj.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/labaloniwinitapugowolat.pdfIn PDF document text
    • http://kleiberit.ru/files/file/piwal.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a68d72d6dc---xejilufi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8eb767e1fe151f58be4e5ccbb3193bc/77872924634.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2f706146753fdaf85d01fdfa0362c3e2/duseladenese.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/85527453766.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbed83330---pokerevo.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/84774254364.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kge5hj1tjomconhrbja4466lf3/zarapatasunideb.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ral1s84luv5pa8b257libnd5f6/rapewilujebumetajaje.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f8ae392f7---nevejipukilebozasomuwe.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/wudedujoponepip.pdfIn PDF document text
    • https://bursac.net/userfiles/file/xirofojevaribumoga.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/306d0e8a96870fa1041fbb0b0d36cb55/68081338734.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_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 17376 bytes
SHA-256: f62bc8841febb1eee42b134bcf61e6c5a753aeb957feb3d1fe98a569726e2003
font_02_sfnt_off00013fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCF 10544 bytes
SHA-256: 60389eb8c62897d2233308bb4a83ed1dea636d440df5c55c6011a050b65acc8b

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