Malicious PDF — malware analysis report

Static analysis result for SHA-256 062a540085e93543…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 12:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53670b34124125b2bc3e9c97b7630176 SHA-1: 49f92ef349caa523b728581bd0c7a9c3eacfd83c SHA-256: 062a540085e935433a0e6a412ef358d15828b5d5544a4381abf3ba441c10320a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=pdf+to+azw+online+converter PDF link annotation
    • http://ryukatsu.com/userData/board/file/38439851433.pdfIn PDF document text
    • https://polaria.cz/images/file/nawuzetakowilonowidor.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/82391210559.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/76357397949.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/lekop.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/26365586024.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/lufusokadekuru.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/buvoxa.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/japovokokebos.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14148497330.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/jesewijasuzolef.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210903085714.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/76792250102.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109070755466255.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/65371649803.pdfIn PDF document text
    • http://nenorm.com/files/files/jaxununobeto.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321a8249b2b---1674718820.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/korolifawukutegete.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/piruritutatulezilubu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161410e9ca6536---jotepivuf.pdfIn PDF document text
    • https://cityface.cz/res/file/17456921531.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/41791122094.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/46055339907.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zutegoninazebevirapi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47fa312a---16094080692.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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 10512 bytes
SHA-256: 2052b10a5bfee787611bbfb5bc44e7c5198a0483814d9d98bf9988ad4961a8fd
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 17096 bytes
SHA-256: 3210b5a53b2cd48008dee1a5711b6191263d134c59a76a88858fa542b9365344
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1