Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b242f347efaeb6…

MALICIOUS

PDF

75.2 KB Created: 2021-07-26 23:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a07eb55bf142d8fef2e242ff9026842d SHA-1: d112cc7e7de1008907d5eb222b27159cc231e954 SHA-256: 73b242f347efaeb689dd4a8677aefcfdddcda24ba5e7efe6b80eb5c3ad54b257
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. The primary purpose appears to be redirecting users to external sites, potentially for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/80b4038b8ea2224318d8a83a63377171/bewuwofusakekepirigus.pdf In PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/lodinuzuvavorabupopepana.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6f35b74fa4e50ae62ff30285ea86fd00/34003666700.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/57051472115.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c33d053c---vejaselinatowuvasozez.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/15318990068.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609276f58119a---disawezixo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4a706e5a3f56fe5cc53ad288445b3683/79191003933.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/481adcc2814400623107b78764e8e06e/gabagamekeliv.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s7ovus26kihkmsr1321tsiua75/wikepotusigujujuwowegi.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070b913910ee---vomegopelorevitufod.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/46809585156.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/14958298442.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u86ur1btfbkalkmuqaaitt2jr0/dumidaj.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/15010525937.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/67072982468.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/nivobilenevolijitenataxa.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/70631554272.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944804c03f3---78191182105.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb6349081---45054201772.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a2271be5---53867247851.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/45783035486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+royal+icing+with+powdered+sugar+and+waterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 11344 bytes
SHA-256: f0b0c328efc5efaa878638de873787ae3645f82e1d778ab7fbf578ceaa1b64f9
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 16000 bytes
SHA-256: a0ffb5d5681db0d3d6e00df8fa988685667dc49b1a607b0c6930ff9e431220ac

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